Patent US2685281A successfully refreshed from Google Patents.
US2685281A
Expired / Lapsed
US
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Variable valve timing assembly for internal-combustion engines
Assignee: Individual
•
Filing: 1953-07-24
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Granted: 1954-08-03
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Expires: 1973-07-24
Abstract
No abstract record available.
Inventors
- 👤 Robert A Macgregor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:40
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/352; F01L2820/00; F01L2820/03; F01L2820/035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1318542A
Cited
US1533947A
Cited
US1654366A
Cited
US1980379A
Cited
US2037051A
Cited
US2057354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |