1
George M Thomas, John W Boretos, Donald C Syracuse, John A Clark, Anthony J Vita, Vincent A Gaudiani: Electrode for artificial pacemaker. The United States of America represented by the Secretary of Health Education and Welfare, John S Roberts Jr, Norman J Latker, Thomas G Ferris, September 12, 1978: US04112952 (64 worldwide citation)

An electrode for implantation in the heart to control atrio-ventricular block by artificial pacemaker including plural electrically conductive wires grouped in a bundle with spring metal arcuate prongs formed on one end thereof. A sheath is provided to compress the prongs for insertion of the electr ...


2
Leendert Vriens, John A Clark, Johannes H M Spruit: Projection television display tube and device having interference filter. U S Philips Corporation, John C Fox, July 28, 1987: US04683398 (29 worldwide citation)

A projection television display tube comprising in an evacuated envelope a display screen on the convexly curved inside of a display window in the wall of the envelope, which display screen comprises a layer of luminescent material and a multilayer interference filter between said material layer and ...


3
John A Clark: Progressive cavity pump for downhole inflatable packer. Halliburton Company, C Dean Dominque, Neal R Kennedy, March 24, 1992: US05097902 (28 worldwide citation)

A progressive cavity pump for inflating downhole inflatable packers. The pump includes a case defining an inlet port and an outlet passageway therein in which the outlet passageway is in communication with the inflatable packer at a location below the pump in the well bore. An elastomeric stator is ...


4
Robert F Kirschner, Lemuel J Morgan, John A Clark Jr: Water heating and storage system. The Patterson Kelley Co, Bean & Bean, September 5, 1972: US3688839 (18 worldwide citation)

A dual mode operative water heating and storage system including a hot water storage tank having a cold water supply inlet for replenishing water withdrawn from the tank, a conduit system for normally circulating water from a lower to an upper level of the tank and including means for heating the ci ...


5
John A Clark Jr: Water heater. Harsco Corporation, Brumbaugh Graves Donohue & Raymond, September 6, 1977: US04046189 (9 worldwide citation)

A water heater comprises an elongated vessel having a heat exchanger that occupies a substantial portion at one end and leaves a minimum volume storage and blending zone at the other end of the vessel. Water is recirculated through the heat exchanger, preferably continuously, through a recirculation ...


6
John A Clark Jr: Double wall heat exchanger. Harsco Corporation, Kerkam Stowell Kondracki & Clarke, January 13, 1987: US04635711 (7 worldwide citation)

In a heat exchanger employing double wall tubing comprising concentric inner and outer tubes, the inner and outer tubes are disposed within apertures of spaced tube sheets and connected thereto by roller expansion of the tubes. To maintain venting of the air space between the tubes, a split wall fer ...


7
John A Clark Jr: Water heater. Harsco Corporation, Kerkam Stowell Kondracki & Clarke, July 14, 1981: US04278069 (7 worldwide citation)

A water heater comprises an elongated vessel having a heat exchanger that occupies a substantial portion at one end and leaves a minimum volume storage and blending zone at the other end of the vessel. Water is recirculated through the heat exchanger, preferably continuously, through a recirculation ...


8
James Doyle, David W Butcher, John A Clark: Multicolor holograms using gelatin as the binder and method for producing the same. Ciba-Geigy, Wenderoth Lind & Ponack, March 28, 1989: US04816360 (4 worldwide citation)

Multicolor holograms using gelatin as the binder and having interference fringes lying in layers parallel to the substrate, the colors of which are visible by reflection in incident natural light, by treating the holographic material which has been holographically exposed and processed to produce a ...


9
John A Clark, Alan Adshead, David W Butcher: Method of preparing a hologram. Ciba-Geigy, Wenderoth Lind & Ponack, January 19, 1988: US04720441 (2 worldwide citation)

A method of preparing a hologram which comprises subjecting holographic material to a holographic exposure, the holographic material comprising a silver halide emulsion of which at least 80% by weight of the halide is bromide, developing the exposed material in a silver halide developing solution to ...


10
William H Brooks, Weldon C Ball, John A Clark: Reducing residual moisture on caster rolls. Norandal USA, Fleit Jacobson Cohn & Price, May 23, 1989: US04831745 (2 worldwide citation)

A method of reducing residual moisture on caster rolls resulting from the application of a water based release agent or lubricant comprises placing a controllable heat source in close proximity to the top and bottom roll of the caster to evaporate the residual moisture from the roll surface.