Patent US2451271A successfully refreshed from Google Patents.
US2451271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
V-type internal-combustion engine
Assignee: Individual
•
Filing: 1945-08-18
•
Granted: 1948-10-12
•
Expires: 1965-08-18
Abstract
No abstract record available.
Inventors
- 👤 George L Balster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:22
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B2275/00; F02B2275/20; F02B2275/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1312585A
Cited
DE305903C
Cited
US923496A
Cited
US977334A
Cited
US1081051A
Cited
GB191505358A
Cited
GB128299A
Cited
US1329811A
Cited
US1404015A
Cited
US1862222A
Cited
US2091370A
Cited
US2254439A
Cited
US2349157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |