US2969804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic valve for air pumps and the like
Assignee: Individual
•
Filing: 1955-05-19
•
Granted: 1961-01-31
•
Expires: 1975-05-19
Abstract
No abstract record available.
Inventors
- 👤 Tolkien Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:37
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/10; F04B39/102; F04B39/1033; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5153; Y10T137/7504; Y10T137/7559; Y10T137/7668; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7937
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US379446A
Cited
US556023A
Cited
US1044300A
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US1359006A
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US1668342A
Cited
US1677056A
Cited
US1993567A
Cited
US2615618A
Cited
US2622842A
Cited
US2613870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |