Pickering Associates, Inc.
18Patents
0Active
18Granted
30Portfolio score
Filing activity: Jul 31, 1975 → Apr 30, 2001
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4445103A | Rotary differential transformer with constant amplitude and variable phase output | Electricity | 20 | Expired |
| USD266244S | Collapsible headset | General | 19 | Expired |
| US4345230A | Multiple rotary variable differential transformer on common shaft with leakage flux compensation | Physics | 11 | Expired |
| US4113266A | Playback stylus for phonograph record stamper | Physics | 10 | Expired |
| US4251807A | Miniature buzzer | Physics | 9 | Expired |
| US6628083B2 | Central battery emergency lighting system | Electricity | 7 | Expired |
| US4437019A | Linear differential transformer with constant amplitude and variable phase output | Physics | 6 | Expired |
| US4113267A | Double stylus assembly for phonograph record stamper playback | Physics | 6 | Expired |
| US4347491A | Rotary variable differential transformer with substantially linear output | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4153257A | Record stamper playback turntable | Physics | 5 | Expired |
| US4409588A | Miniature sounder with multi-part tuned cavities | Physics | 5 | Expired |
| US3964751A | Phonograph cartridge replaceable stylus assembly | Physics | 4 | Expired |
| USD278147S | Phonograph cartridge | General | 1 | Expired |
| US4166625A | Automatic stop for turntable tone arm | Physics | 1 | Expired |
| US3948529A | Phonograph turntable anti-skating device | Physics | 1 | Expired |
| US4129305A | Phonograph turntable electro-thermal cueing control | Physics | 1 | Expired |
| US4140321A | Phonograph cartridge replaceable stylus assembly | Electricity | 0 | Expired |
| US4509159A | Aluminum-aluminum oxide stylus arm | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.