US2833303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control and pressure regulating valve
Assignee: American Air Filter Co Inc
•
Filing: 1953-01-22
•
Granted: 1958-05-06
•
Expires: 1973-01-22
Abstract
No abstract record available.
Inventors
- 👤 Richard W Leutwiler
- 👤 John L Ehretsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:37
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/08; F16K11/085; F16K11/0853; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7782; Y10T137/7793; Y10T137/7805
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2026704A
Cited
US2162779A
Cited
US2309848A
Cited
US2272815A
Cited
US2312191A
Cited
US2573680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |