Patent US3371225A successfully refreshed from Google Patents.
US3371225A
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US
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Clocking pulse rate detection circuitry
Assignee: International Business Machines Corp
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Filing: 1964-12-28
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Granted: 1968-02-27
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Expires: 1984-12-28
Abstract
No abstract record available.
Inventors
- 👤 Featherston John Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:11
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/027; H03; H03D; H03D3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2570431A
Cited
US2820896A
Cited
US3215934A
Cited
US3213370A
Cited
US3111625A
Cited
US3223929A
Cited
US3268816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |