US2671436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiform internal-combustion engine
Assignee: MASSEY HARRIS CO Ltd
•
Filing: 1950-04-08
•
Granted: 1954-03-09
•
Expires: 1970-04-08
Abstract
No abstract record available.
Inventors
- 👤 Pitt Arnold
- 👤 Lorne F Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B2275/00; F02B2275/02; F02B2275/20; Y; Y10; Y10S; Y10S123/00; Y10S123/01; Y10S123/07
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2511823A
Cited
US1370503A
Cited
US1046392A
Cited
US1271354A
Cited
US1276891A
Cited
US1264708A
Cited
FR487430A
Cited
US1274813A
Cited
US1367194A
Cited
US1889583A
Cited
US1993992A
Cited
US2111828A
Cited
US2010183A
Cited
US2140085A
Cited
GB535255A
Cited
GB560287A
Cited
US2452232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |