Patent US3527308A successfully refreshed from Google Patents.
US3527308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ripper attachment for tractor
Assignee: Motors Liquidation Co
•
Filing: 1967-06-09
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Granted: 1970-09-08
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Expires: 1987-06-09
Abstract
No abstract record available.
Inventors
- 👤 Ralph J Bernotas
- 👤 Ronald M Cheers
- 👤 Charles R Holub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
A; A01; A01B; A01B13/00; A01B13/08; A01B63/00; A01B63/02; A01B63/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2657914A
Cited
US2722181A
Cited
US3002574A
Cited
US3031208A
Cited
US3116797A
Cited
US3289771A
Cited
US3348383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |