US2668185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visible liquid level indicating nonspill vent mechanisms
Assignee: Individual
•
Filing: 1950-11-20
•
Granted: 1954-02-02
•
Expires: 1970-11-20
Abstract
No abstract record available.
Inventors
- 👤 Castlen Robert Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:55
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/48; H01M10/484; 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
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1447797A
Cited
US1942630A
Cited
US2055645A
Cited
US2082605A
Cited
US2092214A
Cited
FR810291A
Cited
US2324999A
Cited
GB551867A
Cited
US2343663A
Cited
US2351177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |