US2665771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater air cleaner
Assignee: Houdaille Hershey Corp
•
Filing: 1952-02-18
•
Granted: 1954-01-12
•
Expires: 1972-02-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Sebok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:07
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/16; F02M35/162; F02M35/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US950072A
Cited
US1619029A
Cited
US1922688A
Cited
GB540502A
Cited
FR977145A
Cited
US2412753A
Cited
US2639001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |