US2913871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust systems of internal combustion engines
Assignee: Individual
•
Filing: 1956-11-27
•
Granted: 1959-11-24
•
Expires: 1976-11-27
Abstract
No abstract record available.
Inventors
- 👤 Bradshaw Norman Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:38
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N13/082; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB241657A
Cited
FR631736A
Cited
US1813189A
Cited
US1953120A
Cited
GB433803A
Cited
US2233327A
Cited
US2363113A
Cited
CH243194A
Cited
FR61141E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |