Patent US3534638A successfully refreshed from Google Patents.
US3534638A
Expired / Lapsed
US
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Saw chain sharpener
Assignee: Oregon Tool Inc
•
Filing: 1968-10-25
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Granted: 1970-10-20
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Expires: 1988-10-25
Abstract
No abstract record available.
Inventors
- 👤 Carroll L Van Ourkerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:13
CPC Classifications
B; B23; B23D; B23D63/00; B23D63/08; B23D63/16; B23D63/166; B23D63/168
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3147644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |