Patent US2757677A successfully refreshed from Google Patents.
US1968312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner and silencer
Assignee: Individual
•
Filing: 1933-06-12
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Granted: 1934-07-31
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Expires: 1953-06-12
Abstract
No abstract record available.
Inventors
- 👤 George C Rensink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/14; F02M35/12; F02M35/1205; F02M35/1216; Y; Y10; Y10S; Y10S55/00; Y10S55/21; Y10S55/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-07-30 | 1938-01-29 | 1938-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-07-30 | 1942-01-29 | 1942-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-07-30 | 1946-01-29 | 1946-07-31 | $7700.00 | Window Closed / Lapsed |