MACGRIFF JACK E has a total of 11 patent applications. Its first patent ever was published in 1952. It filed its patents most often in United States and Canada. Its main competitors in its focus markets electrical machinery and energy, measurement and optics are TOKYO KEISO KABUSHIKI KAISHA, OVAL ENG CO LTD and JIANGSU JINYUMING ELECTRONIC CO LTD.
# | Country | Total Patents | |
---|---|---|---|
#1 | United States | 9 | |
#2 | Canada | 2 |
# | Industry | |
---|---|---|
#1 | Electrical machinery and energy | |
#2 | Measurement | |
#3 | Optics | |
#4 | Machines | |
#5 | Audio-visual technology | |
#6 | Engines, pumps and turbines |
# | Technology | |
---|---|---|
#1 | Measuring volume | |
#2 | Electric discharge tubes | |
#3 | Electrography | |
#4 | Unspecified technologies | |
#5 | Cyclically operating valves | |
#6 | Television |
# | Name | Total Patents |
---|---|---|
#1 | Macgriff Jack E | 11 |
#2 | Bacon Marilyn L | 3 |
Publication | Filing date | Title |
---|---|---|
US3283069A | Electron emission control tube and method | |
US3323131A | Image control device with means to precharge the printing gap | |
US3242261A | Electron emission control tube | |
US3056136A | Image control device and method of printing | |
US2934673A | Image control tube | |
US2882365A | Fluid level indicator | |
US2894092A | Fluid level indicator | |
US2777030A | Fluid level indicator | |
US2771336A | Image control tube and method of printing | |
CA752081A | Electron emission control tube | |
CA666315A | Image control device and method of printing |