US3135875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring counter employing four-layer diodes and scaling resistors to effect counting
Assignee: International Business Machines Corp
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Filing: 1961-05-04
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Granted: 1964-06-02
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Expires: 1981-05-04
Abstract
No abstract record available.
Inventors
- 👤 Robert A Leightner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
H; H03; H03K; H03K21/00; H03K21/08; H03K23/00; H03K23/84
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |