Curtis Instruments, Inc.
48Patents
11Active
48Granted
46Portfolio score
Filing activity: Jan 3, 1975 → Sep 12, 2022 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5451881A | Method and means for adjusting battery monitor based on rate of current drawn from the battery | Emerging Cross-Sectional Technologies | 263 | Expired |
| US4514694A | Quiescent battery testing method and apparatus | Emerging Cross-Sectional Technologies | 202 | Expired |
| US4012681A | Battery control system for battery operated vehicles | Emerging Cross-Sectional Technologies | 131 | Expired |
| US4193026A | Method and apparatus for measuring the state of charge of a battery by monitoring reductions in voltage | Physics | 111 | Expired |
| US4560937A | Battery state of charge metering method and apparatus | Physics | 69 | Expired |
| US6611116B2 | Anti-spin control for a separately excited motor drive system | Emerging Cross-Sectional Technologies | 64 | Expired |
| US4460870A | Quiescent voltage sampling battery state of charge meter | Emerging Cross-Sectional Technologies | 57 | Expired |
| USD387333S | Heatsink enclosure for an electrical controller | General | 50 | Expired |
| US4017724A | Apparatus for measuring battery depletion by monitoring reductions in voltage | Physics | 36 | Expired |
| US4626750A | Solid state d.c. motor control | Emerging Cross-Sectional Technologies | 36 | Expired |
| US4388618A | Battery state of charge indicator operating on bidirectional integrations of terminal voltage | Emerging Cross-Sectional Technologies | 34 | Expired |
| US9046559B2 | Isolation monitor | Emerging Cross-Sectional Technologies | 33 | Active |
| US4186339A | Method and apparatus for measuring current, especially useful in multi-ampere systems | Physics | 30 | Expired |
| US4740754A | Bidirectional battery state-of-charge monitor | Emerging Cross-Sectional Technologies | 29 | Expired |
| US6439067B1 | Shaft sensor assembly for angular velocity, torque, and power | Physics | 29 | Expired |
| US5247253A | Eddy current proximity sensing means and method useful for determining throttle position | Electricity | 23 | Expired |
| US4712195A | Solid-state cumulative operations measurement system | Physics | 20 | Expired |
| US4728923A | Steerable wheel direction indicator | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4724332A | Synchronous load lock-out control system for battery powered equipment | Electricity | 15 | Expired |
| US4288734A | Bidirectional integrator | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5261025A | Method and apparatus for DC motor speed control | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6208245A | Engine oil change indicator system | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US6456043B1 | Method of diagnosing the state of health of a battery | Electricity | 13 | Expired |
| US4139896A | Method and apparatus for producing nonlinear integral functions | Physics | 12 | Expired |
| US6181106A | Sequential high-rate charging of battery cells | Emerging Cross-Sectional Technologies | 11 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.