Patent US3539830A successfully refreshed from Google Patents.
US3539830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit particularly for operation in response to variations in resistivity of at least one sensor resistor
Assignee: Whittaker Corp
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Filing: 1966-08-08
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Granted: 1970-11-10
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Expires: 1986-08-08
Abstract
No abstract record available.
Inventors
- 👤 Richard J Zollinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:26
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/225; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |