Patent US2821097A successfully refreshed from Google Patents.
US2821097A
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Apparatus for sharpening saw chains
Assignee: OREGON SAW CHAIN CORP
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Filing: 1955-05-31
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Granted: 1958-01-28
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Raymond R Carlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:58
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)
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US2533648A
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US2589165A
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US2699691A
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US2729987A
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US2716908A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |