Patent US2940249A successfully refreshed from Google Patents.
US2940249A
Expired / Lapsed
US
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Exhaust head for internal combustion engines
Assignee: Volkswagen AG
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Filing: 1956-10-23
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Granted: 1960-06-14
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Expires: 1976-10-23
Abstract
No abstract record available.
Inventors
- 👤 Gospodar Reinhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:03
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1833; F01N13/08; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190512898A
Cited
US1220307A
Cited
US1342159A
Cited
US2073951A
Cited
US2235705A
Cited
US2692025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |