US2491370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof vent plug for storage batteries
Assignee: AT&T Inc
•
Filing: 1946-06-21
•
Granted: 1949-12-13
•
Expires: 1966-06-21
Abstract
No abstract record available.
Inventors
- 👤 Frank T Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:30
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/308; H01M50/383; H01M50/394; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190802727A
Cited
FR560087A
Cited
GB319198A
Cited
US2309331A
Cited
US2298938A
Cited
US2400228A
Cited
US2452066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |