Patent US3170448A successfully refreshed from Google Patents.
US3170448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring
Assignee: Walker Manufacturing Co
•
Filing: 1963-09-13
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Granted: 1965-02-23
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Expires: 1983-09-13
Abstract
No abstract record available.
Inventors
- 👤 Campbell Colin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:50
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/08; F02B77/10; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/025; F02M; F02M1/00; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4323; F02M2700/4326
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
IN A FLAME STOP FOR A CRANKCASE VENTILATION SYSTEM FOR AN ENGINE, A FLOW PASSAGE, A COMPRESSIBLE WIRE SPRING ELEMENT MOUNTED IN SAID PASSAGE, AND MOUNTING MEANS FOR SAID WIRE SPRING ELEMENT PERMITTING COMPRESSION OF SAID WIRE SPRING ELEMENT IN SAID PASSAGE DURING CRANKCASE VENTILATION,
Claim 2
Dependent Claim
45 words
IN A FLAME STOP FOR A CRANKCASE VENTILATION SYSTEM FOR AN ENGINE, A FLOW PASSAGE, A COMPRESSIBLE WIRE SPRING ELEMENT MOUNTED IN SAID PASSAGE, AND MOUNTING MEANS FOR SAID WIRE SPRING ELEMENT PERMITTING COMPRESSION OF SAID WIRE SPRING ELEMENT IN SAID PASSAGE DURING CRANKCASE VENTILATION,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |