US2610221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating vent plug for electric storage batteries
Assignee: Richardson Co
•
Filing: 1949-03-25
•
Granted: 1952-09-09
•
Expires: 1969-03-25
Abstract
No abstract record available.
Inventors
- 👤 Charles L Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:56
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/48; H01M10/484; H01M50/00; H01M50/30; H01M50/308; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1525985A
Cited
US1491143A
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US1508829A
Cited
US1703233A
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US2400228A
Cited
GB594413A
Cited
US2512757A
Cited
US2484163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |