US2847531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching system
Assignee: Individual
•
Filing: 1954-04-21
•
Granted: 1958-08-12
•
Expires: 1974-04-21
Abstract
No abstract record available.
Inventors
- 👤 Edward A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:07
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/02; H01H35/025; H01H36/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1395042A
Cited
GB168350A
Cited
US2339063A
Cited
US2399944A
Cited
US2492727A
Cited
US2611051A
Cited
US2744972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |