US2390913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inlet and exhaust connections for internal-combustion engines
Assignee: CHARLES G BARRETT
•
Filing: 1942-11-30
•
Granted: 1945-12-11
•
Expires: 1962-11-30
Abstract
No abstract record available.
Inventors
- 👤 Charles G Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:50
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/44; F02B27/00; F02B27/005; F02B27/006; F02B27/04; F02B37/00; F02B37/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-10 | 1949-06-11 | 1949-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-10 | 1953-06-11 | 1953-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-10 | 1957-06-11 | 1957-12-11 | $7700.00 | Window Closed / Lapsed |