US2457206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve for internalcombustion engines
Assignee: Individual
•
Filing: 1945-03-16
•
Granted: 1948-12-28
•
Expires: 1965-03-16
Abstract
No abstract record available.
Inventors
- 👤 Bert G Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:44
CPC Classifications
F; F01; F01L; F01L7/00; F01L7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1308466A
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US1431188A
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US646652A
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US813204A
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FR425858A
Cited
US1159553A
Cited
US1189281A
Cited
US1147023A
Cited
US1240126A
Cited
US1539041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |