US3846697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital pickup
Assignee: Airpax Electronics Inc
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Filing: 1972-11-14
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Granted: 1974-11-05
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Expires: 1992-11-14
Abstract
Abstract Disclosed is a digital pickup for counting gear teeth and the like down to zero speed. A pair of magneto-resistors mounted on a permanent magnet sense the gear teeth. The magneto-resistors are connected in a bridge circuit and the bridge output triggers an integrated circuit switch incorporated in the pickup to produce a high voltage, low impedance digital output particularly suited for TTL logic.
Inventors
- 👤 O Cila
- 👤 D Nye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/147; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/481; G01P3/488
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
90 words
A digital pickup comprising a resistance bridge, at least one magneto-resistor being connected in each of two arms of said bridge, a permanent magnet, said magneto-resistors being symmetrically mounted on one pole of said magnet, a solid state switch having set and reset terminals, the output of said bridge being coupled across said set and reset terminals of said switch, said switch comprising an integrated circuit differential amplifier with positive feedback, a junction transistor, and a pair of pickup output terminals coupled to the emitter-collector circuit of said junction transistor.
Claim 2
Dependent Claim
90 words
A digital pickup comprising a resistance bridge, at least one magneto-resistor being connected in each of two arms of said bridge, a permanent magnet, said magneto-resistors being symmetrically mounted on one pole of said magnet, a solid state switch having set and reset terminals, the output of said bridge being coupled across said set and reset terminals of said switch, said switch comprising an integrated circuit differential amplifier with positive feedback, a junction transistor, and a pair of pickup output terminals coupled to the emitter-collector circuit of said junction transistor.
Claim 3
Dependent Claim
18 words
A pickup according to claim 1 including a zener diode coupled across said pair of pickup output terminals.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |