US2931013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical selecting systems
Assignee: Post Office
•
Filing: 1954-01-18
•
Granted: 1960-03-29
•
Expires: 1974-01-18
Abstract
No abstract record available.
Inventors
- 👤 Harris Lionel Roy Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:24
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2683731A
Cited
US2512676A
Cited
US2666809A
Cited
US2584739A
Cited
US2770678A
Cited
US2662116A
Cited
US2727094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |