Patent US2660611A successfully refreshed from Google Patents.
US2660611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonspillable vent plug for storage batteries
Assignee: Individual
•
Filing: 1953-03-09
•
Granted: 1953-11-24
•
Expires: 1973-03-09
Abstract
No abstract record available.
Inventors
- 👤 Owen G Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:45
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/308; H01M50/60; H01M50/609; H01M50/627; H01M50/636; H01M50/645; H01M50/655; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0874
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |