US2920613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swirl producing inlet port for internal combustion engine
Assignee: Individual
•
Filing: 1957-12-09
•
Granted: 1960-01-12
•
Expires: 1977-12-09
Abstract
No abstract record available.
Inventors
- 👤 Vogel Wolfgang
- 👤 Lachmann Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:55
CPC Classifications
F; F02; F02B; F02B31/00; F02B31/04; F02B31/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB226800A
Cited
FR1134506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |