Patent US2851220A successfully refreshed from Google Patents.
US2851220A
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Transistor counting circuit
Assignee: Beckman Coulter Inc
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Filing: 1954-11-23
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Granted: 1958-09-09
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Expires: 1974-11-23
Abstract
No abstract record available.
Inventors
- 👤 Richard E Kimes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:41
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/40; H03K23/50; H03K23/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2436963A
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US2533001A
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US2594336A
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US2670445A
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US2644896A
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US2644897A
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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) | 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 |