US3028581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching device
Assignee: International Business Machines Corp
•
Filing: 1959-05-28
•
Granted: 1962-04-03
•
Expires: 1979-05-28
Abstract
No abstract record available.
Inventors
- 👤 Allan C Thorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:13
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/81
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2853693A
Cited
US2790160A
Cited
US2734184A
Cited
US2856596A
Cited
US2901735A
Cited
US2931017A
Cited
US2820956A
Cited
US2817079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |