Preformed Non-metallic Only Patents (Class 404/64)
  • Patent number: 4817963
    Abstract: A method of sealing a joint between two adjacent members comprises the steps of forming a gap between the members to be sealed and then introducing a bead of resilient solid material into the gap. The bead is subsequently treated to render it temporarily plastic or fluid so as to cause it to adhere to the facing edges of the members. This treatment can best be effected using a hot air blower. The bottom of the bead may be provided with a non-adhesive strip to prevent adhesion to the bottom of the gap, or the process may be performed in such a way that the bottom portion of the bead is not fused so that it does not adhere to the bottom of the gap.
    Type: Grant
    Filed: March 31, 1987
    Date of Patent: April 4, 1989
    Assignee: Hot Melt Systems Limited
    Inventors: Alan J. Munden, John R. Leith
  • Patent number: 4815247
    Abstract: An apparatus for sealing expansion joints between concrete slabs and the like comprises a compression seal member, which fits within the expansion joint and provides an airtight and watertight seal; and a surface cover plate, which provides a planar pedestrian treadway, supports vertical loads, prevents dirt and debris from entering and accumulating within the expansion joint, and provides an aesthetically pleasing appearance.
    Type: Grant
    Filed: February 9, 1987
    Date of Patent: March 28, 1989
    Assignee: MM Systems Corporation
    Inventors: John D. Nicholas, Larry M. Petree, Julian J. Attaway
  • Patent number: 4815886
    Abstract: A new self supporting expansion joint for use in the preparation of concrete products which comprises a single unit molded inverted T having a flat base adapted for resting on the ground and a vertical beam perpendicularly joined to the center of said base, said beam being thicker at the point of junction with the base than at the top of said beam, the plastic being used for at least a portion of said beam being prepared from a plastic material that compresses and expands on temperature change.
    Type: Grant
    Filed: November 20, 1987
    Date of Patent: March 28, 1989
    Inventor: Evan L. Madsen
  • Patent number: 4743036
    Abstract: An elastomeric compression seal for sealing expansion grooves in bridges or the like. The seal comprises a plurality of congruently linked cells having vertical side walls and convex upper walls. The seal is characterized by a controlled collapse which prevents the convex upper walls from elongating upwardly upon lateral compression of the seal. This controlled collapse is accomplished by downwardly extending V-shaped walls connected at their upper edges to the vertical walls. As the seal is compressed, the V-shaped walls collapse such that their apexes are displaced downwardly. This downward force is transmitted to the central portion of the convex upper walls by vertical connectors to negate the tendency of the convex walls to distort upwardly upon compression.
    Type: Grant
    Filed: April 16, 1986
    Date of Patent: May 10, 1988
    Assignee: MM Systems Corporation
    Inventor: John D. Nicholas
  • Patent number: 4740404
    Abstract: The waterstop used to prevent passage or leakage of water through a construction joint of concrete is shaped of a plastic or rubber in the form of a continuous-length belt-like form and provided with a water-swellable rubbery layer on at least a portion, or, for example, along the peripheries of the belt-like form, side-by-side coming into contact with the concrete bodies to serve as a water-tight filling of the joint by being swollen with water. The water-swellable rubbery layer is protected temporarily prior to use with a coating film of an alkali-soluble polymeric material which can at least partially be dissolved away by the alkalinity of the water in the concrete joint. The peripheries of the plastic- or rubber-made belt-like form are preferably in a length-wise bulged form having a bore running therethrough to serve as a stress absorber when the water-swellable rubbery layer is swollen with water.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: April 26, 1988
    Assignee: C. I. Kasei, Co. Ltd.
    Inventors: Shozo Otsugu, Michiyoshi Terauchi, Hiroharu Sasayama, Yuji Ishihara, Takashi Kushida
  • Patent number: 4717162
    Abstract: An elastomeric seal having substantially hollow body having a polygonal cross section formed by a bottom wall, a pair of opposed spaced side walls, a top wall and a plurality of internal supporting struts symmetrically arranged about the center of the polygonal cross section. The top wall is formed of a pair of arms extending in a V to each other, the apex of which lies along the center line between the side walls. The side walls are themselves bent inwardly intermediate their ends to extend perpendicular to the respective arms of the top walls. Compression of the parallel side walls, toward each other, causes the inwardly bent portions of the side walls to rotate outwardly resulting in a raising of the apex of the top wall so that the top wall assumes a flat configuration.
    Type: Grant
    Filed: May 19, 1987
    Date of Patent: January 5, 1988
    Inventors: Mario Trieste, James J. Whelan, II
  • Patent number: 4708517
    Abstract: A device for sealing the joint between adjacent structural members such as concrete slabs in bridges, parking decks, and the like, and for absorbing thermal expansion and contraction of the adjacent structural members. The compression seal employs a cross-sectional configuration comprising a square center cell within a square outer seal structure to provide an advantageous movement rating while minimizing vertical elongation of the seal during compression. As lateral compressive forces are exerted on the vertical sides of the outer square by thermal expansion of the adjacent structural members, the seal collapses in a controlled manner, the square center cell redirecting lateral compressive forces to support the upper and lower seal walls. Thus, the upper wall of the seal provides a substantially planar pedestrian treadway even as the seal is compressed.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: November 24, 1987
    Assignee: MM Systems Corporation
    Inventors: John D. Nicholas, Larry M. Petree, Julian J. Attaway
  • Patent number: 4699540
    Abstract: An expansion joint is shown for use in joining adjacent concrete sections separated by an expansion slot such as in a roadway having concrete sections and a slot therebetween. The joint includes a preformed longitudinal sealing element which is formed of a resilient material and installed within the slot. An initially flowable adhesive material is applied between the sealing element and opposing side surfaces of the concrete sections making up the joint. The moduli of elasticity of the adhesive material and sealing element are selected so that forces exerted upon the joint by expansion and contraction of the concrete sections result in movement of the central sealing element, rather than exerting strain upon the adhesive bond.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: October 13, 1987
    Assignee: JMK International, Inc.
    Inventors: Robert M. Gibbon, J. William Houtz
  • Patent number: 4637085
    Abstract: A joint spanning construction for bridges has a sealing body flush with the top edge of the road surface and comprising beading made of resilient rubber material inserted into recesses of open-topped sills. The beading is secured against lifting out by retainer bodies of circular cross-section which are fitted half in the walls of the sill recesses and half in the beading. The sills respectively feature webs, which have approximately parallel sides and which are directed towards the road surface so as to extend into the beading. The sections of beading separated by the webs feature concave recesses on their sides opposite the respective webs, and in each case the outer one of such recesses is engaged by the retainer body concerned.
    Type: Grant
    Filed: April 25, 1985
    Date of Patent: January 20, 1987
    Inventor: Alfred Hartkorn
  • Patent number: 4625485
    Abstract: Elastomeric multi-tubular glands, which are adapted to exert reactive thrust when the gland is compressed and relieved within a movement tolerance space between relatively movable bodies, are provided, featuring a generally hexagonal wall member and a strut wall inside the hexagonal wall member, for the strut wall to share I-beam properties with front and back side walls of the hexagonal wall member, having the gland further include opposed means connected with the hexagonal wall member adjacent to a pair of apexes formed by the remaining side walls of the hexagonal wall member, for the opposed means to press and relieve the hexagonal wall member in response to the relative movement of the bodies while the gland leads laterally across the movement tolerance space between the bodies. In certain embodiments, mount fixtures are provided in system with the gland so as to be secured to the bodies as components thereof and carry the gland.
    Type: Grant
    Filed: January 14, 1986
    Date of Patent: December 2, 1986
    Assignee: MM Systems Corporation
    Inventor: John D. Nicholas
  • Patent number: 4622784
    Abstract: A waterstop for concrete structures, of the type consisting of an extruded strip of elastomeric material having a general flat medial portion extending between longitudinally ribbed side wing anchor portions is internally pressurized so as to compensate for dimensional changes of the concrete joint.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: November 18, 1986
    Inventors: David A. Black, John J. F. Deans
  • Patent number: 4616460
    Abstract: Longitudinally multi-tubular elastomeric glands, and in certain embodiments elastomeric gland and mount systems, are provided for the gland or system to be combined with relatively movable bodies to close off a movement tolerance space between the bodies, the gland being characterized longitudinally laterally centrally by including in the structure thereof a generally octagonal wall member wherein a pair of forward and rearward side walls of the octagonal wall member produce an I-beam aspect with an intermediate strut wall of the gland, inside the octagonal wall member, having the intermediate strut wall flanked on opposite sides thereof by another pair of side walls of the octagonal wall member and by structure in the gland for supporting the octagonal wall member at the latter two side walls and transmitting and relieving thrust against the octagonal wall member as prescribed by the relative movement of the bodies.
    Type: Grant
    Filed: December 3, 1985
    Date of Patent: October 14, 1986
    Assignee: MM Systems Corporation
    Inventor: John D. Nicholas
  • Patent number: 4522413
    Abstract: In the current practice of using an extruded elastomeric strip as a seal in a concrete expansion joint, in which the transverse walls more particularly are embodied with a chevron shape, the improvement thereto consisting of making the angled walls of the chevron steeper and spaced more centrally thereof, so that the seal both maintains continuous contact with the vertical faces of the expansion joint and also has a predictably consistent response to compressive forces.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: June 11, 1985
    Assignee: Elastomer Seals, Inc.
    Inventor: John D. Nicholas
  • Patent number: 4457522
    Abstract: A comparatively wide sealing strip extruded of elastomeric material that in practice is used for sealing expansion grooves in bridges or the like, having a conventional arrangement of external functional walls, and in which the internal support walls that are provided to prevent collapse in the external walls while the elastomeric construction material is curing, cooperate to form a centrally located hexagonally shaped wall arrangement that flattens out when the seal is subjected to external compressive forces, and in this way enables the seal to offer an optimum minimum resistance to change to a diminished size.
    Type: Grant
    Filed: March 24, 1983
    Date of Patent: July 3, 1984
    Inventors: Mario Trieste, John D. Nicholas
  • Patent number: 4437785
    Abstract: An elastomeric seal member for sealing roadway and structural expansion joints. The seal member is of generally rectangular configuration and includes top, bottom, and side walls, the side walls being linear and the top and bottom walls including means to cause deflection thereof to occur in a downward direction. Internal support members include right and left spaced apart struts, upper and lower spaced apart ribs, and corner trusses. The struts extend from the top wall to the bottom wall, each strut including generally straight upper and lower portions, the spacing between the upper ends of the upper portions either being the same or slightly greater than the spacing between the lower ends of the upper portions, and the lower portions of the struts extending downwardly and outwardly from the upper portions. The upper and lower ribs are positioned between the top and bottom walls and extend transversely from one of the side walls to the other side wall.
    Type: Grant
    Filed: January 25, 1983
    Date of Patent: March 20, 1984
    Assignee: Acme Highway Products Corp.
    Inventor: Guy S. Puccio
  • Patent number: 4421272
    Abstract: Anchoring bars are disclosed which are installed at the joint between surfacing modules laid end to end along or between a pair of rails in a railroad-highway grade crossing. The modules are of the elastomeric type. Each module is provided with an improved series of surface gutters of different depths with complementary spike wells extending into the elastomer to drain water away. The elastomeric surface layer of the modules is bonded to one or more reinforcing, corrugated steel subgrade surfacing members which cooperate with the anchor bars and the elastomeric layer to lock the modules together.
    Type: Grant
    Filed: March 4, 1982
    Date of Patent: December 20, 1983
    Assignee: Structural Rubber Products Company
    Inventor: Jacob O. Whitlock
  • Patent number: 4367976
    Abstract: An expansion joint seal assembly for sealing a roadway gap, which includes a pair of spaced apart elongated anchoring channel extrusion members to be secured in structural slab portions oppositely bounding the gap, and an elongated resilient sealing strip member for sealing the gap between the anchoring channel members. The anchoring channel members have an anchoring cavity opening toward the gap shaped to define a constricted entrance throat portion opening to the gap and communicating with a transversely enlarged, inner retaining chamber portion, and the strip member has a diaphragm web portion providing distortable folds and anchoring bead formations each forming substantially a hollow triangle in cross-section providing a back wall portion and a pair of forwardly converging walls which form an apex located below a horizontal reference plane extending through the vertical midpoints of back wall portion and provide a shallow concave trough immediately subjacent each apex.
    Type: Grant
    Filed: June 30, 1980
    Date of Patent: January 11, 1983
    Assignee: Bowman Construction Supply, Inc.
    Inventor: William E. Bowman
  • Patent number: 4366590
    Abstract: The connecting strip is made of a resilient material and is adapted to be inserted into a joint, a connecting element (16) engaging in an undercut groove (9) in the edge-element (7,8) of a joint. A continuous longitudinal notch (13) in the strip facilitates deformation of the connecting element (16). In order to facilitate the installation of the said strip in the sealing position in the joint, the said notch is arranged on the inside of the said connecting element, and the latter is buckled towards the middle of the joint, thus opening the notch. In the ultimate position, the connecting element is straightened and the notch closed.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: January 4, 1983
    Assignee: Waldemar Koster
    Inventors: Reinhold Huber, Waldemar Koster
  • Patent number: 4362427
    Abstract: A resilient, deformable, adhesive-free sealing strip for expansion joints in concrete comprises an elongated central core with a reinforcing web embedded therein. First, second and third pairs of fins extend from opposite sides of the central core, the first pair being shorter than the second and third pairs, the first pair disposed at the top of the strip and the second and third pairs being disposed at spaced intervals down the elongated core. Each pair of fins has a combined width greater than the width of the joint to be sealed. Upon insertion of the strip, the second and third pairs of fins are substantially deformed in the direction opposite insertion, exerting pressure against the concrete void walls, and through the central core, against one another, firmly locking the strip in place. The first pair of fins are only moderately so deformed, sealing the open top of the joint.
    Type: Grant
    Filed: May 30, 1980
    Date of Patent: December 7, 1982
    Assignee: Schlegel Corporation
    Inventors: Ronald H. Mass, Daniel L. Maloney
  • Patent number: 4362430
    Abstract: An expansion joint for bridges and similar structures comprising an elastomeric sealing element, anchoring means gripping the sealing element and resin mortar connecting the anchoring means to the structure. The resin mortar is comprised of a mixture of ureide and epoxy resins and aggregate. The anchoring means has rods embedded in the resin mortar to distribute stresses therein.
    Type: Grant
    Filed: October 24, 1980
    Date of Patent: December 7, 1982
    Inventor: Marcel Ceintrey
  • Patent number: 4362428
    Abstract: An expansion joint seal for closing a gap between spaced-apart structural members has an elongated body including longitudinal side edges, an upper corrugated treadway surface, a lower undersurface, and an internal web structure including a plurality of laterally spaced vertically disposed webs each having an upper pair of cross-bars extending upwardly and outwardly therefrom and connected to the upper treadway and a lower pair of cross-bars extending downwardly and outwardly therefrom. An additional lower cross-bar extends from each side edge downwardly and inwardly to a pair of curved surfaces, and a vertically disposed web extends between the juncture of the curved surfaces and the centermost cross-bars. An upper cross-bar extends upwardly and inwardly from each side edge to the upper treadway surface.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: December 7, 1982
    Assignee: Acme Highway Products Corporation
    Inventor: James J. Kerschner
  • Patent number: 4351622
    Abstract: A seal having an elongated body including a mounting portion extending along its longitudinal edges for securement to a pair of spaced-apart structural members defining a gap therebetween in an expansion joint assembly. The seal has an intermediate expansion portion formed integral with the mounting portion and having an upper treadway surface formed with at least three integrally connected corrugated members each having a central, substantially planar surface and a pair of inclined legs extending downwardly and outwardly to form a substantial V-shaped groove at the joinder of adjacent legs, the outermost legs being integrally connected to the mounting portions. A lower expansible section is formed with at least two laterally spaced protuberances and an integral connecting section joining the protuberances.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: September 28, 1982
    Assignee: Acme Highway Products Corporation
    Inventor: James J. Kerschner
  • Patent number: 4329080
    Abstract: A joint former for hardenable material such as concrete comprises two essentially identical web members which are releasably attached to each other by a two-part friction coupling to form an assembly which is generally a T-shaped assembly. Each web is configured along at least one edge to form a first coupling part and along a central portion of at least one surface to form a second complementary coupling part so that any two of such webs can be attached to each other to provide a T-shaped assembly. In use the web forming the body of the T is inserted into the hardenable material, the bar web serving to align and position the inserted web. The bar web is then detached from the inserted web and releasably attached to another essentially identical web to form another T-shaped assembly suitable for use in the manner just described.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: May 11, 1982
    Assignee: Schlegel Corporation
    Inventor: John E. Elley
  • Patent number: 4287696
    Abstract: An expansible caulking material in strip form is disclosed suitable for use in sealing joints between vertical panels, and packing wide expansion joints occurring in decks of parking garages, bridges, airport runways and the like, with a shortened expansion time particularly for use in cold locations where the expansibility by reason of the adhesive impregnant would be unduly delayed. The caulking material comprises compressed and expansible strips of open cell plastic foam with one or more wires or strips therewith with the foam normally retained in compressed condition until ready for use, and in which an electric current is applied to the ends of the wires or strips to supply heat to speed up the expansion.
    Type: Grant
    Filed: July 10, 1979
    Date of Patent: September 8, 1981
    Inventor: William T. Mullen
  • Patent number: 4210698
    Abstract: The resistance of structural elastomer products, such as bearing blocks, to compressive forces is reduced by incorporating therein a plurality of small, separate, reinforcing elements of relatively hard material. Such materials include crushed rock, concrete, glass or certain slags and small metal pieces. The reinforcing elements are congregated in an interior section or core which is covered by a marginal section substantially free from reinforcing elements.
    Type: Grant
    Filed: March 21, 1978
    Date of Patent: July 1, 1980
    Assignee: Watson Bowman Associates, Inc.
    Inventor: Stewart C. Watson
  • Patent number: 4195850
    Abstract: In order to form a tighter seal, especially at corner butt joints, between polygonal construction plate elements which are pressed together at their edges with an intervening gasket strip, the strip is provided at its critical sealing section with a second material of greater elasticity than the first, main gasket material. A third material which plastically deforms under pressure is partially embedded in the second material. The pressure of the second material when compressed forces the third material to flow into low seal pressure spaces and gaps of the seal to form a bonded seal with a seal pressure which is distributed by the deformation of the third material. Various configurations of the gasket cross-section and of corner segments are described.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: April 1, 1980
    Assignee: Datwyler AG, Schweiz. Kabel-Gummi-u.Kunststoffwerke
    Inventors: Ernst Berger, Norbert Herwegh
  • Patent number: 4179226
    Abstract: An expansion joint seal for use in roadways, bridges and the like adapted for use with a pair of elongated, parallel spaced-apart edge members defining a gap therebetween and each of the edge members having a generally C-shaped cavity opening towards said gap. The seal includes mounting beads on each of its longitudinal edges for reception within the aforesaid edge member cavities and a double walled, resilient web construction spanning the aforesaid gap and being attached to the mounting beads. The double walls of the web are disposed in an upper and lower relative relationship to one another and are connected to the mounting beads at correspondindly upper and lower portions thereon. The upper and lower web walls fold downwardly upon movement of the edge members towards one another and corresponding reduction in width of the gap.
    Type: Grant
    Filed: October 2, 1978
    Date of Patent: December 18, 1979
    Assignee: Acme Highway Products Corporation
    Inventor: Guy S. Puccio
  • Patent number: 4141189
    Abstract: A novel method is disclosed for installing elongated hollow resilient sealing members in the expansion and contraction joints of buildings and pavements by exerting force through an opening in the wall thereof on a limited area of the interior surface of the hollow resilient sealing members to cause their hollow cross-sectional dimensions to expand into the joint and contract transversely of the joint. Structural modifications of elongated hollow resilient sealing members required to adapt them for installation by the novel method are described. Novel sealing members having structural features required for installation by the novel method are disclosed.
    Type: Grant
    Filed: May 20, 1977
    Date of Patent: February 27, 1979
    Inventor: Jan T. Borjeson
  • Patent number: 4119387
    Abstract: Pavement joint structures utilizing laterally spaced, elongated metal frames with a four-sided, compartmented, elongated, elastomer seal locked in the frames and spanning the space, the seal having a double arch, nadir-to-apex internal web structure.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: October 10, 1978
    Assignee: The D. S. Brown Company
    Inventor: Delmont D. Brown
  • Patent number: 4098043
    Abstract: A hollow elastomeric seal member having a bottom wall particularly formed to facilitate installation of the seal within an expansible joint.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: July 4, 1978
    Assignee: Harry S. Peterson Company
    Inventor: Samuel D. McCready
  • Patent number: 4084912
    Abstract: A method and gap sealing assembly for sealing adjacent roadway slabs at the gap. Gap sealing members bridging the gap are positioned in end-to-end array. A resistance heater is positioned adjacent elastomeric end surfaces of the members and a rubber-like heat activatable bonding agent is positioned between the end surfaces. When the heater is energized, the end surfaces are bonded to each other to form a seal in situ.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: April 18, 1978
    Assignee: Felt Products Mfg. Co.
    Inventors: Lawrence F. Pyle, John F. Brady
  • Patent number: 4050206
    Abstract: An expansion jointing material for placing concrete, mortar or the like which comprises a jointing material of elastic substance and a cover member placed over the jointing material and extending in the longitudinal direction thereof. In operation, a plurality of the jointing materials are preliminarily positioned and adjusted to a predetermined height along the partition lines to form a plurality of partitions into which concrete, mortar or the like is deposited to produce laid surfaces of concrete or the like using the upper portions of the cover members as the reference levels. The jointing materials are completely buried in the concrete, mortar or the like except the upper portions of the cover members to absorb or compensate for the expansion or contraction of the concrete, mortar or the like.
    Type: Grant
    Filed: August 5, 1975
    Date of Patent: September 27, 1977
    Inventor: Akira Utsuyama
  • Patent number: 4043693
    Abstract: Elongated, hollow elastomer seals particularly useful for the sealing of bridge deck joints, bridge approach joints and like wide joints against intrusion by liquids and incompressible solids and embodying a transversely concave top wall; side walls and a bottom wall, and an internal web structure with a pair of webs extending respectively between intermediate portions of the top wall located intermediate the longitudinal midportion thereof and respective side walls and respective intermediate portions of laterally extending internal webs to resist inward rolling of the upper longitudinal corners of the seal away from the joint faces when the seal is seated under lateral compression in a joint.
    Type: Grant
    Filed: March 24, 1976
    Date of Patent: August 23, 1977
    Assignee: The D. S. Brown Company
    Inventor: Delmont D. Brown
  • Patent number: 3982365
    Abstract: A distribution block, which comprises a body having a trapezoidal longitudinal section and toothing bars projecting on the said body and extending from an inclined face to the upper face thereof.
    Type: Grant
    Filed: June 18, 1975
    Date of Patent: September 28, 1976
    Inventors: Albert D. G. Noel, deceased, by Josette D. Noel, sole heir
  • Patent number: 3968611
    Abstract: A dilation joint strip of rubber, synthetic rubber or other synthetic material having a substantially flat middle portion and side wings, said side wings being provided with anchorage means for anchoring said wings in concrete, the substantially flat middle portion being provided at either side with a strip of elastic cellular material extending in the longitudinal direction of said substantially flat middle portion.
    Type: Grant
    Filed: September 9, 1974
    Date of Patent: July 13, 1976
    Assignee: International B. F. Goodrich-Europe B.V.
    Inventor: Eduard Herman Louis de Munck
  • Patent number: 3960462
    Abstract: A resilient sealing member for use in an expansion joint comprising a tubular body having an internal truss structure which includes a pair of intersecting crossbars extending between the sidewalls and bottom wall of the tubular body. The sealing member, being of the low pressure type, further includes a vertically disposed compression bar extending between the midportion of the top wall of the member and the intersection of the crossbars to exert a downward pressure on the crossbars during compression of the member to thus reduce some of the sidewall pressures in a manner resulting in a substantially level pressure profile across the vertical dimension of the sidewalls.
    Type: Grant
    Filed: July 21, 1975
    Date of Patent: June 1, 1976
    Assignee: Acme Highway Products Corporation
    Inventor: James J. Kerschner