Patent US3397893A successfully refreshed from Google Patents.
US3397893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder construction
Assignee: International Motors LLC
•
Filing: 1966-08-03
•
Granted: 1968-08-20
•
Expires: 1986-08-03
Abstract
No abstract record available.
Inventors
- 👤 Keith W Kampert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:43
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2042569A
Cited
US2658809A
Cited
US2801140A
Cited
US2907614A
Cited
US3132568A
Cited
US3266810A
Cited
US3312150A
Cited
US3314683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |