LOCKHART MARSHALL L has a total of 19 patent applications. Its first patent ever was published in 1934. It filed its patents most often in United States and Canada. Its main competitors in its focus markets medical technology, machines and audio-visual technology are DCA DESIGN INTERNATIONAL LTD, FANGROW JR THOMAS F and DCA DESIGN INT LTD.
# | Country | Total Patents | |
---|---|---|---|
#1 | United States | 16 | |
#2 | Canada | 3 |
# | Industry | |
---|---|---|
#1 | Medical technology | |
#2 | Machines | |
#3 | Audio-visual technology | |
#4 | Chemical engineering | |
#5 | Engines, pumps and turbines |
# | Name | Total Patents |
---|---|---|
#1 | Lockhart Marshall L | 19 |
Publication | Filing date | Title |
---|---|---|
US2706479A | Ampule | |
US2586069A | Syringe assembly | |
US2586068A | Syringe assembly | |
US2568346A | Syringe structure | |
US2490447A | Syringe assembly | |
US2514883A | Hypodermic syringe | |
US2556331A | Tubular ampoule closure | |
US2448898A | Hypodermic needle | |
US2457313A | Hypodermic syringe | |
US2574339A | Hypodermic syringe | |
US2398544A | Hypodermic injector | |
US2380534A | Hypodermic injector | |
US2343195A | Starting mechanism for internal combustion engines | |
US2322245A | Ypodermic injector and method of use thereof | |
US2322244A | Hypodermic injector | |
US2145449A | Sound pick-up and amplifying apparatus | |
CA422309A | Hypodermic injector | |
CA443162A | Hypodermic syringe | |
CA446360A | Hypodermic syringe |