Otis Engineering Corporation
472Patents
2Active
472Granted
44Portfolio score
Filing activity: Jul 12, 1972 → Aug 28, 1992
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4425965A | Safety system for submersible pump | Fixed Constructions | 140 | Expired |
| US5188182A | System containing expendible isolation valve with frangible sealing member, seat arrangement and method for use | Fixed Constructions | 134 | Expired |
| US4288082A | Well sealing system | Mechanical Engineering; Lighting; Heating | 132 | Expired |
| US5172717A | Well control system | Emerging Cross-Sectional Technologies | 131 | Expired |
| US4919204A | Apparatus and methods for cleaning a well | Fixed Constructions | 128 | Expired |
| US4636934A | Well valve control system | Emerging Cross-Sectional Technologies | 120 | Expired |
| US4396061A | Locking mandrel for a well flow conductor | Fixed Constructions | 109 | Expired |
| US5176164A | Flow control valve system | Emerging Cross-Sectional Technologies | 109 | Expired |
| US4473245A | Pipe joint | Mechanical Engineering; Lighting; Heating | 105 | Expired |
| US4436150A | Bridge plug | Fixed Constructions | 97 | Expired |
| US5211241A | Variable flow sliding sleeve valve and positioning shifting tool therefor | Fixed Constructions | 97 | Expired |
| US4399871A | Chemical injection valve with openable bypass | Emerging Cross-Sectional Technologies | 96 | Expired |
| US5004049A | Low profile dual screen prepack | Fixed Constructions | 93 | Expired |
| US5293551A | Monitor and control circuit for electric surface controlled subsurface valve system | Electricity | 90 | Expired |
| US5094340A | Gripper blocks for reeled tubing injectors | Performing Operations; Transporting | 89 | Expired |
| US5226483A | Safety valve landing nipple and method | Fixed Constructions | 86 | Expired |
| US4930573A | Dual hydraulic set packer | Fixed Constructions | 83 | Expired |
| US4981173A | Electric surface controlled subsurface valve system | Fixed Constructions | 80 | Expired |
| US4633954A | Well production controller system | Emerging Cross-Sectional Technologies | 79 | Expired |
| US4655291A | Injector for coupled pipe | Fixed Constructions | 78 | Expired |
| US5107927A | Orienting tool for slant/horizontal completions | Fixed Constructions | 78 | Expired |
| US4753444A | Seal and seal assembly for well tools | Emerging Cross-Sectional Technologies | 77 | Expired |
| US5174379A | Gravel packing and perforating a well in a single trip | Fixed Constructions | 76 | Expired |
| US4248302A | Method and apparatus for recovering viscous petroleum from tar sand | Fixed Constructions | 75 | Expired |
| US4624315A | Subsurface safety valve with lock-open system | Fixed Constructions | 73 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.