US2990820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating mechanism of main shaft of oil engine
Assignee: Individual
•
Filing: 1958-05-01
•
Granted: 1961-07-04
•
Expires: 1978-05-01
Abstract
No abstract record available.
Inventors
- 👤 Saijo Genzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:46
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/26; F02B75/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189630010A
Cited
US1285835A
Cited
US1268561A
Cited
AT85423B
Cited
US1353390A
Cited
US2273025A
Cited
US2280669A
Cited
US2234187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |