Patents by Inventor Robert C. Stewart

Robert C. Stewart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5491054
    Abstract: A silver halide photographic element comprising a light sensitive silver halide containing layer which also contains a 2-equivalent pyrazolone magenta coupler, a thiomorpholine dioxide compound which has an alkoxy substituted aryl group substituent on the ring nitrogen, a compound of formula (I) below, and a hydroquinone compound of formula (R) below: ##STR1## wherein: R.sub.3, R.sub.4 and R.sub.31 are independently an alkyl group or H; R.sub.11, R.sub.12 and R.sub.21 are alkyl groups.The presence of the compound (I) when used with the two-equivalent pyrazolone magenta coupler and compounds (R) and (S), can result in a photographic element with low printout and/or thermal discoloration problems.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: February 13, 1996
    Assignee: Eastman Kodak Company
    Inventors: Rakesh Jain, William R. Schleigh, Robert C. Stewart
  • Patent number: 5484696
    Abstract: A silver halide photographic element having a light sensitive silver halide which layer also contains a 2-equivalent pyrazolone magenta coupler, a compound of formula (S) below, and a hydroquinone compound of formula (R) below: ##STR1## wherein: R.sub.1 is an alkyl group; and R.sub.2, R.sub.3 and R.sub.4 are independently an alkyl group or H.The presence of the compound (S) when used with the two-equivalent pyrazolone magenta coupler and compound (R), can result in low magenta dye fade, increased wavelength of maximum absorption of the magenta dye and increased magenta dye bandwidth.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: January 16, 1996
    Assignee: Eastman Kodak Company
    Inventors: Rakesh Jain, William R. Schleigh, Robert C. Stewart
  • Patent number: 5350452
    Abstract: A flowable substance is applied to at least one predetermined area of a major surface of a plate-shaped fuel cell component by directing at least one stream of the flowable substance toward a predetermined zone that is situated in a plane along which the major surface of the component extends, facing the stream. The size of the predetermined zone is smaller than that of the predetermined area, and relative movement along the plane is effected between the component and the predetermined zone so that at least the entire predetermined area of the major surface gradually advances through the predetermined zone in a predetermined advancement direction and path. The stream is controlled so that it is in existence only while the zone is completely within the predetermined area, and until the zone has coincided with all of the predetermined area.
    Type: Grant
    Filed: October 8, 1992
    Date of Patent: September 27, 1994
    Assignee: International Fuel Cells Corporation
    Inventors: Richard J. Rempe, Robert C. Stewart, Jr.
  • Patent number: 5344668
    Abstract: A flowable substance is applied to at least one predetermined area of a major surface of a plate-shaped fuel cell component by directing at least one stream of the flowable substance toward a predetermined zone that is situated in a plane along which the major surface of the component extends, facing the stream. The size of the predetermined zone is smaller than that of the predetermined area, and relative movement along the plane is effected between the component and the predetermined zone in such a manner that at least the entire predetermined area of the major surface gradually advances through the predetermined zone in a predetermined advancement direction and path. The stream is controlled in such a manner that it is in existence only while the zone is completely within the predetermined area, and until the zone has coincided with all of the predetermined area.
    Type: Grant
    Filed: December 26, 1991
    Date of Patent: September 6, 1994
    Assignee: International Fuel Cells Corporation
    Inventors: Richard J. Rempe, Robert C. Stewart, Jr.
  • Patent number: 5264582
    Abstract: A method of preparing a washout photographic coupler comprising a coupler moiety (COUP) containing a substituted or unsubstituted ballasted releasing group (A) selected from aryloxy, thioaryloxy, heterocyclicoxy, and thioheterocyclicoxy releasing groups having attached thereto a phenoxy timing group containing a photographically useful group (PUG), the releasing group capable of elimination electron transfer to release the timing group, the method comprising:(a) providing a coupler moiety (COUP) having the releasing group (A) in a coupling off position, the releasing group (A) having on at least one of the 2- or 4-position a substituted or unsubstituted halomethyl;(b) reacting a substituted or unsubstituted hydroxyaryl aldehyde or hydroxyaryl ketone with the halomethyl group of step (a) in the presence of an alkylpyridine and a dipolar aprotic solvent to form a first product; and(c) reducing the first product and halogenating the reduced first product before reacting with a photographically useful group to fo
    Type: Grant
    Filed: June 24, 1992
    Date of Patent: November 23, 1993
    Assignee: Eastman Kodak Company
    Inventors: William J. Begley, Robert C. Stewart
  • Patent number: 5250026
    Abstract: An implant injector for animals is adjustable for implant insertion depth. The distance, that the injector needle or cannula, extends past the nose of the injector is adjustable. The insertion depth adjustment is accomplished by moving the nose of the injector relative to the tip of the cannula that extends past the nose. In addition to adjusting the insertion depth, the cannula or needle, may also be rotated to a plurality of positions relative to the injector handle.A spring loaded plunger, when released by a release button, will push the implant out the end of the cannula as the operator withdraws the cannula from the animal. The release button is designed as a safety trigger to avoid premature activation of the plunger during insertion of the needle.Needles, or cannulas of various diameters and lengths, may be interchanged in the injector.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: October 5, 1993
    Assignee: Destron/IDI, Inc.
    Inventors: Paul Ehrlich, Larry J. Dixon, Robert C. Stewart
  • Patent number: 5239081
    Abstract: A process for preparation of a 2,3 or 4-oxo-benzaldehyde or ketone compound by reaction of a 2,3 or 4-hydroxy benzaldehyde or ketone with an ortho, meta or parabromo or chloralkylphenoxy compound comprises reaction of the bromo or chloroalkylphenoxy compound with potassium iodide to form an iodo compound in situ; then, reaction of the resulting product with a 2, 3 or 4-hydroxybenzaldehyde or ketone in the presence of alkylpyridine and a dipolar aprotic solvent. The resulting compounds are useful for formation of photographic color couplers for use in photographic materials.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: August 24, 1993
    Assignee: Eastman Kodak Company
    Inventors: William J. Begley, Robert C. Stewart
  • Patent number: 5056391
    Abstract: A stripper apparatus retains a workpiece in position relative to a punch press apparatus during the punching operation without marking or damaging a contacted surface of the workpiece. The stripper device is an axially elongate, resiliently compressible sleeve with a through axial bore which freely passes over the punch permitting the punch to travel therethrough. The stripper device removably attaches to a coupler or coupling portion which is also used to attach the punch to a punch stem of the punch press apparatus. Removable attachment is achieved utilizing keyways formed in the coupling portion and matingly engagable keys integrally formed on a corresponding surface of the stripper device. Additionally, peripheral flanges are integrally formed on the stripper which mate with the outside surface of the coupling portion to provide greater retention of the stripper device on the coupler.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: October 15, 1991
    Inventor: Robert C. Stewart
  • Patent number: 5026503
    Abstract: An improved aqueous catalytic oxidation-reduction composition for oxidizing hydrogen sulfide to produce elemental sulfur and a method of removing hydrogen sulfide from a gas stream whereby a gas stream containing hydrogen sulfide is brought into contact with an aqueous catalytic oxidizing reaction composition containing a water soluble polyvalent metal salt having metal in the highest valence state and at least one nonionic surfactant having an HLB of from about 8 to about 10, preferably about 8.5 to about 9, which is adapted to wet the elemental sulfur formed. The nonionic surfactant is present in the reaction solution in an amount sufficient to substantially prevent formation of sulfur froth at the surface of the reaction solution and to cause the sulfur to precipitate as a granular solid that can be recovered by filtration, by centrifucation, or other similar means.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: June 25, 1991
    Assignee: Amoco Corporation
    Inventor: Robert C. Stewart
  • Patent number: 4950563
    Abstract: Corrosion in manifolds and ducts in phosphoric acid fuel cells can be reduced by electroplating a chromium-fluorocarbon polymer composite coating onto the exposed metal surfaces. The chromium-fluorocarbon coating displays superior corrosion protection and improved adhesion after being subjected to a plurality of heating and cooling cycles. The improved corrosion protection enhances fuel cell operating reliability and allows the use of less expensive materials in the construction of the manifolds and ducts.
    Type: Grant
    Filed: December 27, 1988
    Date of Patent: August 21, 1990
    Assignee: International Fuel Cells
    Inventors: Robert C. Stewart, Jr., Vincent J. Petraglia
  • Patent number: 4762301
    Abstract: A ball valve having a two component body with a bonnet section formed integrally with one of the body components. A first body member defines a first flow passage and a first end of a valve chamber. The second body member forms a second flow passage and a second end of the valve chamber. Formed about the first flow passage is a first sleeve member which extends axially into the valve chamber. A cylindrical stem receiving chamber is also formed in the first body member and extends radially outwardly from the valve chamber to open to the exterior of the first body member through an inwardly facing shoulder. Inner and outer radially spaced sleeves are formed integrally with the second body member and extend into the valve chamber circumferentially about the second flow passage. The inner sleeve is aligned with the first sleeve member formed about the first flow passage on the first body member. A valve ball is mounted in the chamber in axial alignment with the first and second flow passages.
    Type: Grant
    Filed: February 6, 1987
    Date of Patent: August 9, 1988
    Assignee: Whitey Co.
    Inventors: Richard F. Wozniak, Robert C. Stewart, Peter C. Williams
  • Patent number: 4670300
    Abstract: A method for making a carbon-graphite component of the type adapted for use in an electrochemical cell is disclosed. The precursor sheet structure for the component contains cellulose and purified graphite powder which provides certain advantages during processing and in the final products.
    Type: Grant
    Filed: July 3, 1985
    Date of Patent: June 2, 1987
    Assignee: International Fuel Cells Corporation
    Inventor: Robert C. Stewart, Jr.
  • Patent number: 4606495
    Abstract: A method of forming thin, uniform braze joints is effected through the use of curtain coating. Braze powder is admixed with a liquid polymeric binder to form a slurry. The slurry is forced through the slots in a curtain coating head and deposited on at least one of the metal surfaces to be bonded together. The method has particular utility for bonding fin/plate sections of a heat exchanger where the fins have a U-shaped cross section. The slurry is deposited on the top portion of the fin and the side portion of the fin and wiped from the top portion leaving braze material primarily on the side wall portion. When the plates are contacted to the fins and heating performed, a bond is effected with maximum plate-to-fin contact for high heat transfer and a strong braze joint.
    Type: Grant
    Filed: January 14, 1986
    Date of Patent: August 19, 1986
    Assignee: United Technologies Corporation
    Inventors: Robert C. Stewart, Jr., Carl K. Johnson, Leonard J. Bonville, Jr.
  • Patent number: 4599048
    Abstract: Suction apparatus, particularly designed for handling liquid and semi-liquid materials in an industrial context, comprises a suction tank provided with simultaneously operable exhauster and discharge pumps each driven by a common compressed air source. The operational parameters of the pumps and the dimensions of conduits are such that during operation to raise a given liquid or semi-liquid the mean depression in the tank falls at least intermittently to a value at which the discharge pump can raise the contents of the tank. The arrangement enables continuous operation or suction to reclaim or handle liquid or semi-liquid material.
    Type: Grant
    Filed: April 11, 1985
    Date of Patent: July 8, 1986
    Inventors: Robert C. Stewart, Colin O. Hart
  • Patent number: 4568633
    Abstract: A process for obtaining highly stable color photographic images utilizes a silver halide photographic element comprising an essentially colorless, immobile compound which is capable of complexing with ferrous ions to form a dye. The complexing compound contains a complexing moiety which is represented by the formula: ##STR1## wherein m is zero or a positive integer 1 to 3, n and p are independently 0 or 1 and represents a single or double bond. Z is R.sup.1 --N.dbd., O.dbd., S.dbd., R.sup.1 --P.dbd., (R.sup.1).sub.2 P-- or (R.sup.1).sub.3 P.dbd., and when Z is (R.sup.1).sub.2 P--, n is 1, otherwise n is 0. R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are independently hydrogen, amino, hydroxy, mercapto, alkoxy, alkyl, aryl or a heterocyclic moiety. When R.sup.6 is so defined, p is 1 and is a single bond. If m is 0, R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, and R.sup.3 and R.sup.
    Type: Grant
    Filed: January 2, 1985
    Date of Patent: February 4, 1986
    Assignee: Eastman Kodak Company
    Inventors: Frank V. Lovecchio, James A. Reczek, Robert C. Stewart
  • Patent number: 4478776
    Abstract: A method of making a thin, flexible, pliable matrix material for a molten carbonate fuel cell is described. The method comprises admixing particles inert in the molten carbonate environment with an organic polymer binder and ceramic particle. The composition is applied to a mold surface and dried, and the formed compliant matrix material removed.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: October 23, 1984
    Inventors: Donald L. Maricle, Gary C. Putnam, Robert C. Stewart, Jr.
  • Patent number: 4345671
    Abstract: A guide rail section is pushed up a hoistway through a guide funnel by a hydraulic lift pad. The guide funnel is detachably mounted to a wall bracket. The guide rail section is retained in the hoistway while the lift pad is lowered. Another guide rail section is positioned on the lift pad and aligned with the guide rail section retained in the hoistway. The aligned guide rail sections are connected by a fishplate. The guide rail section retained in the hoistway is released and the lift pad is raised pushing the connected guide rail sections up the hoistway through guide funnels. The procedure is repeated until a stack of guide rail sections of the appropriate length is assembled.
    Type: Grant
    Filed: March 12, 1980
    Date of Patent: August 24, 1982
    Assignee: Westinghouse Electric Corp.
    Inventors: Larry P. Tosato, Henry A. Wehrli, Robert C. Stewart, deceased
  • Patent number: 4331178
    Abstract: The invention pertains to a synthetic plastic underground valve curb box utilizing a removable base which may be assembled to the primary curb box casing by a "snap-on" motion, and wherein the curb box supports and encompasses a synthetic plastic service valve and holds the valve in a firm manner preventing the valve from twisting or disorienting itself relative to the curb box. Further, the valve employs an operating head capable of accommodating the two primary types of operating wrenches, and the valve head cleans itself of foreign matter.
    Type: Grant
    Filed: November 6, 1980
    Date of Patent: May 25, 1982
    Assignee: Handley Industries, Inc.
    Inventors: Edward W. Handley, Robert C. Stewart
  • Patent number: 4310015
    Abstract: The invention pertains to a synthetic plastic underground valve curb box assembly consisting of a vertically oriented casing adapted to enclose a buried valve wherein a base is associated with the curb box upon which the valve rests. The casing and base are locked together by "snap-on" connecting means wherein the casing may be pushed upon the base and automatically locks thereto by resiliently biased connectors, and the base permits a greater degree of valve support than previously attainable, the base being usable with both metal and plastic conduit valves.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: January 12, 1982
    Inventors: Robert C. Stewart, Richard C. Stewart
  • Patent number: D344574
    Type: Grant
    Filed: September 25, 1991
    Date of Patent: February 22, 1994
    Assignee: Whitey Co.
    Inventors: Cal R. Brown, Jeffrey T. Jeromson, Robert C. Stewart