21
Bardon Melvin C, Bauernfeind Norman G: Method of making a heat exchanger and a heat exchanger. Modine Manufacturing Company, Hofgren Wegner Allen Stellman & McCord, February 18, 1975: US3866675 (30 worldwide citation)

A method of making a heat exchanger having a tank and spaced tubes which comprises positioning an end of each tube snugly within a slot all of which are spaced from each other in a header plate. Each slot has an open end at an edge of the header plate and a closed end spaced from the opposite edge o ...


22
Schmitz Joseph F: Self-propelled upright vacuum cleaner. Whirlpool Corporation, Hofgren Wegner Allen Stellman & McCord, December 17, 1974: US3854164 (29 worldwide citation)

A vacuum cleaner structure having self-propelling means. A handle is associated with the vacuum cleaner and the self-propelling means to drive the vacuum cleaner in accordance with force applied forwardly or rearwardly to the handle. The handle is biased to an Off position. The driving force develop ...


23
Lindenschmidt Robert E: Refrigerator door construction and method of forming the same. Whirlpool Corporation, Hofgren Wegner Allen Stellman & McCord, May 13, 1975: US3882637 (28 worldwide citation)

An insulated door construction such as for use as a refrigerator door having an inner liner secured to an outer panel by a snap-in association. A gasket is secured to the door by a portion of the snap-in retaining structure eliminating the need for screws and gasket retainers. The door is reinforced ...


24
Thompson Duncan M, Needham Lyle L: Crowd gate. Babson Bros Co, Hofgren Wegner Allen Stellman & McCord, April 23, 1974: US3805741 (28 worldwide citation)

A crowd gate for urging animals, for example, cows, toward a desired position as, for example, a milking parlor. The crowd gate includes a carriage which is adapted to ride on an overhead track and which swingably mounts a depending gate which may come into contact with an animal standing on a surfa ...


25
Hoffmann Carter Clifford, Berger Richard R: Portable food service equipment. Carter Hoffmann, Hofgren Wegner Allen Stellman & McCord, March 19, 1974: US3797563 (27 worldwide citation)

Portable food service equipment adapted to be used in cafeterias or the like and which may be alternately used for food heating or cooling purposes. The exemplary embodiment includes a wheeled cart mounting an open topped container adapted to receive food. The container includes mounting means for a ...


26
Bashark Larry Thomas: Sensor for dishwasher. Whirlpool Corporation, Hofgren Wegner Allen Stellman & McCord, March 11, 1975: US3870417 (27 worldwide citation)

A method and apparatus for determining the condition of liquid, such as a dishwashing liquid, including means for determining the turbidity of the liquid and means for determining a preselected amount of evaporation of the liquid so as to determine a dryness condition. Means are provided for directi ...


27
Burt Harold S: Product picking stacker crane system. Conco, Hofgren Wegner Allen Stellman & McCord, January 1, 1974: US3782564 (26 worldwide citation)

A method of building up an order of selected different product layers on a shipment pallet from a plurality of stored pallets each having a single product and with the stored pallets warehoused in storage bins and a stacker crane system for performing this function. A stacker crane has a platform mo ...


28
Hice Sr Jack O: Apparatus for processing food. Vari Phase, Hofgren Wegner Allen Stellman & McCord, June 25, 1974: US3818818 (26 worldwide citation)

A method of heat treating food including the steps of subjecting the food to be heat treated to superatmospheric pressure in a gaseous atmosphere prior to the application of heat to the food, applying heat to the food while maintaining the superatmospheric pressure on the food, rapidly cooling the f ...


29
Brogan Patrick J: Tube fitting. Imperial Eastman Corporation, Hofgren Wegner Allen Stellman & McCord, December 2, 1975: US3923323 (25 worldwide citation)

A tube fitting having a recess in the body bore for receiving the distal end of a tube to be coupled inwardly of a constrictible sleeve adapted to be constricted about the tube end as the result of threaded movement between a nut and the body portion of the fitting in the make-up thereof. The recess ...


30
Westergren George A, Koland David G, Eggert Thomas F: Canister vacuum cleaner latching means. Whirlpool Corporation, Hofgren Wegner Allen Stellman & McCord, May 28, 1974: US3812659 (25 worldwide citation)

A canister vacuum cleaner having a base and a hood selectively closable on the base. A filter bag for receiving dirt laden air through a hose connected to a pickup wand is retained within the canister by an adapter. A locking member is secured to the base for releasably retaining the filter bag adap ...