Patent US3003789A successfully refreshed from Google Patents.
US3003789A
Expired / Lapsed
US
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Universal hillside hydraulic hitch
Assignee: Calkins Manufacturing Co
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Filing: 1960-03-11
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Granted: 1961-10-10
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Expires: 1980-03-11
Abstract
No abstract record available.
Inventors
- 👤 Oscar C Calkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:06
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/14; A01B63/24; A01B63/245; A01B15/00; A01B15/20; A01B23/00; A01B23/04; A01B73/00; A01B73/02; A01B73/04; A01B73/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |