US2909587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency power unit
Assignee: Individual
•
Filing: 1955-11-15
•
Granted: 1959-10-20
•
Expires: 1975-11-15
Abstract
No abstract record available.
Inventors
- 👤 Anderson B Smedley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:15
CPC Classifications
F; F21; F21S; F21S9/00; F21S9/02; F21S9/022; H; H01; H01M; H01M6/00; H01M6/30; H01M6/36; H01M6/38; H02; H02J; H02J9/00; H02J9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1882472A
Cited
US2026205A
Cited
US2682567A
Cited
US2502723A
Cited
US2452049A
Cited
US2529511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |