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US2478798A
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Primary cell vent and method of making
Assignee: Individual
•
Filing: 1946-06-25
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Granted: 1949-08-09
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Expires: 1966-06-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:39
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/342; H01M50/3425; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1428399A
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US741675A
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US1366298A
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US1732158A
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FR648257A
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US1865764A
Cited
GB379502A
Cited
US2203797A
Cited
US2235101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |