Patent US1640842A successfully refreshed from Google Patents.
US3588864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for supervision of operation of a machine
Assignee: Individual
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Filing: 1969-07-09
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Granted: 1971-06-28
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Expires: 1989-07-09
Abstract
Abstract A SWITCH COMPRISISNG A CENTER CONTACT FRICTIONALLY CARRIED ON A REVERSIBLY MOVING PART AND A PAIR OF SPACED SIDE CONTACTS IS CONNECTED TO A CAPACITOR TO PRODUCE A CHARGING DISCHARGING PULSE ONLY UPON REVERSAL OF THE PART. CIRCUITS ACTUATED BY THE PULSE INCLUDE VARIOUS SIGNALLING AND CONTROL FUNCTIONS AND MAY INCLUDE TRANSISTOR AMPLIFIERS, TIMING CIRCUITS, RELAYS, AND A DIODE NETWORK FEEDING A TRANSFORMER WITH THE BASE-EMITTER CIRCUIT OF A TRANSISTOR ACROSS THE SECONDARY.
Inventors
- 👤 Wallace E Gaulke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
B; B60; B60R; B60R16/00; B60R16/02; B60R16/023; B60R16/0231; G; G08; G08B; G08B21/00; G08B21/02; G08B21/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |