US3463132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for increasing the efficiency of internal combustion engines
Assignee: JAMES H KRIECK
•
Filing: 1967-06-26
•
Granted: 1969-08-26
•
Expires: 1987-06-26
Abstract
No abstract record available.
Inventors
- 👤 James H Krieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:10
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/023; F01M13/04; F01M2013/0438; Y; Y10; Y10S; Y10S55/00; Y10S55/19; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7748; Y10T137/7749
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |