US2851638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage magnitude comparison circuit
Assignee: Reeves Instrument Corp
•
Filing: 1957-07-03
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Granted: 1958-09-09
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Expires: 1977-07-03
Abstract
No abstract record available.
Inventors
- 👤 Roland C Wittenberg
- 👤 Sandler Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:43
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/24; H03K5/2472
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2772410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |