Patents Represented by Attorney Dennis G. Millman

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  • Shaping glass sheets by gravity sag bending followed by blow forming
    Patent number: 4233050
    Abstract: This invention covers shaping glass sheets to complicated shape by first preliminarily shaping said sheets to a prebent shape while supported on an outline mold, then completing the shape while cradling the prebent sheets within a thin flexible blanket of fiber glass cloth during final shaping by blow forming. This invention also covers a technique of cradling glass sheets in a flexible fiber glass blanket that is wrapped over the margin of the glass sheets to be shaped by blow forming. The margin of the blanket is reversely wrapped over a frame-like ring that prevents the marginal edge from curling and maintains the cradle in tension against the lower major surface of the glass sheet during shaping by blow forming.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: November 11, 1980
    Assignee: PPG Industries, Inc.
    Inventors: John A. Comperatore, David J. Wise, Edward D. Black
  • Method and apparatus for shaping glass sheets by drop forming
    Patent number: 4233049
    Abstract: Heat-softened glass sheets are held by a flat vacuum platen and dropped onto a shaping mold to impart the desired curvature to the glass sheet.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: November 11, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Samuel L. Seymour
  • Ceramic roll drive and support mechanism and a method of using same
    Patent number: 4230475
    Abstract: A rotatable roll for conveying glass sheets during thermal treatment comprising a frangible ceramic roll of cylindrical configuration engaged in compression stress between a pair of metal spindles, one of which is coupled to drive means for rotation and both of which spindles are provided with heads approximately coextensive in cross-section with the end surfaces of the frangible ceramic roll. The interfacial surfaces between the end surfaces of the rolls and the heads of the spindles are provided with friction material. The other of said pair of metal spindles is biased in compression to apply axial compression stress to the ceramic roll while the latter rotates in unison with the spindles. A method of using a conveyor comprising at least some of said ceramic rolls for the thermal treatment of glass sheets is also described.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: October 28, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Ronald G. Dunk
  • Shaping glass sheets by drop forming with differential vacuum release
    Patent number: 4229199
    Abstract: In a drop forming process for shaping glass sheets, wherein a glass sheet is dropped from a flat vacuum platen onto a shaping mold, the final curvature of the glass is controlled by releasing a portion of the glass sheet from the platen prior to releasing the remainder of the glass sheet.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: October 21, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Samuel L. Seymour
  • Apparatus for bending glass sheets to complicated curvatures using localized supplementary heating
    Patent number: 4229201
    Abstract: Apparatus for shaping a glass sheet to a complicated shape including a pair of sharply bent areas extending across its transverse dimension and a substantially spherically sagged portion intermediate the areas of sharp bending.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: October 21, 1980
    Assignee: PPG Industries, Inc.
    Inventors: John A. Comperatore, Edward D. Black, David J. Wise
  • Drop forming glass sheets with auxiliary shaping means
    Patent number: 4229200
    Abstract: Heat softened glass sheets are held by a flat vacuum platen, portions of the glass sheet are pre-shaped by auxiliary shaping means while the glass sheet is being held, and then the glass sheet is dropped onto a shaping mold to impart the complete desired curvature to the glass sheet.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: October 21, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Samuel L. Seymour
  • Shaping glass sheets by drop forming with sag control means
    Patent number: 4227908
    Abstract: Spacer elements affixed to the face of a flat vacuum platen induce a temporary reverse bow in a heat softened glass sheet held on the platen. The bowing is in the opposite direction from that of the final curvature, so that when the glass sheet is subsequently dropped onto a shaping mold the resulting sag in at least one direction is reduced.
    Type: Grant
    Filed: June 1, 1979
    Date of Patent: October 14, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Samuel L. Seymour
  • Glass sheet tempering apparatus
    Patent number: 4225333
    Abstract: This invention relates to tempering curved, hot glass sheets supported with their concavely shaped major surfaces facing a first set of pipe-type nozzles and their convexly shaped major surfaces facing a second set of bar-type nozzle housings while tempering medium is applied simultaneously under pressure against said major surfaces.
    Type: Grant
    Filed: November 15, 1978
    Date of Patent: September 30, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Robert G. Frank
  • Glass sheet vacuum molding apparatus with uniform release means
    Patent number: 4221580
    Abstract: This invention relates to improvements in handling glass sheets during shaping. Each glass sheet in turn is heated to its deformation temperature and conveyed into a glass shaping station. The glass is lifted into engagement with an upper vacuum shaping mold while hot and held against the vacuum shaping mold by vacuum as the glass lifting mechanism retracts downward. A transfer and tempering ring-like member having an outline supporting surface conforming to and slightly inside the periphery of the bent glass sheet is brought into a position below the upper vacuum shaping mold. The vacuum on the upper mold is released to deposit the shaped glass sheet on the ring-like member. In case the outline of the glass sheet is irregular, the shaped glass may become tilted as it falls toward the ring-like member and be deposited in a misaligned position relative to said ring-like member.
    Type: Grant
    Filed: October 25, 1978
    Date of Patent: September 9, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Robert G. Frank
  • Method for forming an accurately assembled laminate utilizing a vacuum holding press
    Patent number: 4220491
    Abstract: Two sheets are brought into accurately controlled registry with one another to form a laminate by indexing and retaining each sheet on a separate vacuum platen and then bringing the platens together along a fixed locus.
    Type: Grant
    Filed: October 19, 1978
    Date of Patent: September 2, 1980
    Assignee: PPG Industries, Inc.
    Inventors: Gerald S. Metcalf, Paul J. Kovacik
  • Method of shaping moving sheets on roll forming apparatus
    Patent number: 4218232
    Abstract: In forming heat-softened sheets by the roll forming method, continuously moving sheets of heat-softenable material, such as glass sheets, are conveyed continuously by spaced rotating cylindrical rolls along a conveyer into a roll forming station, where a set of rotating shaping rolls move transversely upward between adjacent stationary cylindrical conveyor rolls to provide rolling engagement against the lower surface of each moving glass sheet in succession in spaced relation above the level of the path of travel defined by the stationary conveyor rolls for sufficient time to shape the sheets. The sets of rotating shaping rolls move the shaped sheet onto a conveyor that extends through a cooling station. The sheets are flat entering the roll forming station and shaped to a curved configuration on leaving the roll forming station. The upper surfaces of the sheets are not touched during said shaping.
    Type: Grant
    Filed: January 18, 1979
    Date of Patent: August 19, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Richard E. Wilhelm
  • Strengthened translucent glass-ceramics and method of making
    Patent number: 4218512
    Abstract: Glass-ceramic articles which are translucent are strengthened by creating a surface compression layer by controlling the crystallization process to yield different crystalline forms at the surface and in the interior.
    Type: Grant
    Filed: January 4, 1979
    Date of Patent: August 19, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Ties Allersma
  • Cooling of edge stretching rollers for use in making flat glass
    Patent number: 4218231
    Abstract: An edge roll machine for contacting a marginal portion of a body of glass being formed into a continuous sheet of glass while floating on molten metal is provided with a glass-engaging edge roll having an internal fluid coolant distributor having spiral vanes to direct the coolant against the surface the periphery of the roll in order to provide gripping contact with molten glass while avoiding sticking of the roll to the glass.
    Type: Grant
    Filed: February 15, 1979
    Date of Patent: August 19, 1980
    Assignee: PPG Industries, Inc.
    Inventors: Robert G. Lemmon, Jr., Melvin F. Earnest
  • Method for inserting electrodes into glass melting tanks
    Patent number: 4215461
    Abstract: Drilling through a wall of a molten material containing vessel, such as a glass melting tank, for the purpose of inserting an electrode or the like, is facilitated by employing a drill rig in which the drill bit is carried on the end of the electrode, which in turn is mounted on reciprocating means. The reciprocating means preferably includes a fast-travel mechanism and a high-powered hydraulic cylinder acting in tandem.
    Type: Grant
    Filed: January 31, 1979
    Date of Patent: August 5, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Richard A. Caripolti
  • Multiple glazed unit
    Patent number: 4215164
    Abstract: A multiple glazed window unit employing a room temperature vulcanizable sealant is disclosed. The sealant comes in the form of two relatively low viscosity components, each of which has an unlimited storage life. When it is desired to apply the sealant, the components are fed to an extruder and blended together to form a cold flowable mastic material of relatively low viscosity which cures at room temperature to form a firm, tacky, resilient seal. Because each of the two components of the sealant composition are of low viscosity, the sealant can be extruded at relatively low temperatures, thus preventing rapid curing and insuring that the sealant composition will have an initial low viscosity, thereby permitting it to be applied to a multiple glazed unit with low temperature and pressure equipment.
    Type: Grant
    Filed: June 9, 1975
    Date of Patent: July 29, 1980
    Assignee: PPG Industries, Inc.
    Inventor: George H. Bowser
  • Method of impressing an accent line in bent glass sheets with a heated tube
    Patent number: 4210436
    Abstract: An accent line is produced in a glass sheet by pressing a tubular member against the glass sheet as it is being press bent. The tubular member is heated by passing hot fluid, e.g., air, therethrough.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: July 1, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Vaughn R. Imler
  • Method of making accent lines in bent glass sheets
    Patent number: 4210435
    Abstract: An accent line is produced in a glass sheet by pressing a rod-shaped member against the glass sheet as it is being press bent. The rod-shaped member may be heated electrically or by passage through a furnace along with the glass sheet.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: July 1, 1980
    Assignee: PPG Industries, Inc.
    Inventor: George R. Claassen
  • Controlling glass sheet buffeting during quenching
    Patent number: 4209314
    Abstract: In tempering glass sheets vertically hung from tongs, the uniformity with which tempering medium is applied toward the glass sheets during quenching is improved by providing the quenching apparatus with means to provide finer control of the flow rate of tempering medium against the opposite major surfaces of the glass sheets than one gets from valving branch conduits in order to prevent side-to-side swaying of the glass sheets during quenching, particularly when the sheets are curved. Such means to provide fine control is also useful in quenching glass sheets supported in other than vertical orientations during quenching.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: June 24, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Samuel L. Seymour
  • Edge stretching apparatus including insulated seal
    Patent number: 4204856
    Abstract: An apparatus for sealing between edge control machines and forming chamber sidewalls is disclosed. The invention comprises collar means mounted surrounding the barrel of the edge control machine, alignment means fastened to the edge control machine for maintaining the collar aligned with the barrel of the edge control machine, and a flexible sleeve between the collar and the forming chamber sidewall.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: May 27, 1980
    Assignee: PPG Industries, Inc.
    Inventors: Jeffrey S. Yigdall, James A. Zahler
  • Glass sheet alignment means and method of using
    Patent number: 4204853
    Abstract: Glass sheets are brought into accurate alignment with bending means while horizontally disposed by urging the glass sheets into contact with a contoured line of abutment. Some embodiments permit simultaneous aligning of a plurality of glass sheets side-by-side.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: May 27, 1980
    Assignee: PPG Industries, Inc.
    Inventor: Samuel L. Seymour