US3537257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion pistion engine with controlled air injection into both exhaust duct and cylinder
Assignee: Standard Triumph Motor Co Ltd
•
Filing: 1968-10-21
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Granted: 1970-11-03
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Expires: 1988-10-21
Abstract
No abstract record available.
Inventors
- 👤 Henry George Webster
- 👤 Lewis Henry Dawtrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:12
CPC Classifications
F; F02; F02B; F02B47/00; H; H10; H10W; H10W74/00; H10W74/40; H10W74/43; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S60/00; Y10S60/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2052279A
Cited
US2263318A
Cited
US2991766A
Cited
US3147588A
Cited
US3359721A
Cited
US3364677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |