US2851054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flutter valves
Assignee: Individual
•
Filing: 1945-10-25
•
Granted: 1958-09-09
•
Expires: 1965-10-25
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Campbell
- 👤 Ralph C Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/02; F02K7/06; F16; F16K; F16K15/00; F16K15/14; F16K15/1401; F16K15/16; F16K15/162; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036; Y10T137/7504; Y10T137/7559; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7879; Y10T137/7888; Y10T137/7891; Y10T137/7892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US952523A
Cited
US1240848A
Cited
US1995727A
Cited
US2161769A
Cited
US2408056A
Cited
US2402208A
Cited
US2432213A
Cited
US2505757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |