Patent US3420180A successfully refreshed from Google Patents.
US3420180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear pump
Assignee: Caterpillar Inc
•
Filing: 1967-07-21
•
Granted: 1969-01-07
•
Expires: 1987-07-21
Abstract
No abstract record available.
Inventors
- 👤 Bertwin E Behrends
- 👤 James L Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:15
CPC Classifications
F; F04; F04C; F04C13/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1687523A
Cited
US1631591A
Cited
US1902346A
Cited
US2301496A
Cited
US2820416A
Cited
US2944487A
Cited
US3080819A
Cited
US3018641A
Cited
US3137137A
Cited
US3242867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |