CO-TECH DEVELOPMENT CORP.
30Patents
8Active
30Granted
42Portfolio score
Filing activity: Nov 27, 1974 → Jun 23, 2021 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4876989A | Enhanced performance of alcohol fueled engine during cold conditions | Emerging Cross-Sectional Technologies | 33 | Expired |
| US7544656B2 | Long acting injectable insulin composition and methods of making and using thereof | Human Necessities | 29 | Expired |
| US4960085A | Pneumatic and electro-pneumatic starters | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US5054406A | Water retardant covering material for solid waste landfills | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4509896A | Turbine rotor | Emerging Cross-Sectional Technologies | 20 | Expired |
| US5018459A | Method and apparatus for recycling paper pulp sludge | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4207568A | Underwater communications system | Electricity | 19 | Expired |
| US5610936A | Extended multiply folded optical paths | Electricity | 13 | Expired |
| US5267539A | Electro-pneumatic engine starter | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5392721A | Method for recycling papermaking sludge | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US4119797A | Voice operated switch having an activation level which is higher than its sustaining level | Electricity | 13 | Expired |
| US4494499A | System and apparatus providing a two step starting cycle for diesel engines using a pneumatic starter | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4123622A | Protective cover for sound transducers located in face masks of divers | Electricity | 12 | Expired |
| US4518310A | Apparatus for preventing overspeed of a turbine drive means | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4008983A | Tip turbine inflating device with motor-actuated closure at inlet | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4507047A | Hoop turbine | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US6948392B2 | Inertia drive torque transmission level control and engine starter incorporating same | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5420803A | Enhanced resolution wafer thickness measurement system | Physics | 6 | Expired |
| US3959711A | Pulse width modulated power supplies | Electricity | 6 | Expired |
| US5006054A | Low density heat resistant intermetallic alloys of the Al.sub.3 Ti type | Chemistry; Metallurgy | 5 | Expired |
| US5572448A | Enhanced resolution imaging and measurement systems | Physics | 3 | Expired |
| US11053602B2 | Micro-roughened electrodeposited copper foil and copper foil substrate | Emerging Cross-Sectional Technologies | 1 | Active |
| US8172017B2 | Circumferential movement device | Emerging Cross-Sectional Technologies | 1 | Active |
| US11047061B2 | Micro-roughened electrodeposited copper foil and copper foil substrate | Emerging Cross-Sectional Technologies | 1 | Active |
| US4830571A | Pneumatic starters | Mechanical Engineering; Lighting; Heating | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.