Patent US3453756A successfully refreshed from Google Patents.
US3453756A
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US
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Reversible excavating tooth
Assignee: Smith International Inc
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Filing: 1968-03-13
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Granted: 1969-07-08
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Expires: 1988-03-13
Abstract
No abstract record available.
Inventors
- 👤 Fred W Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:46
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/28; E02F9/2866; E02F9/2808; E02F9/2816; E02F9/2825
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1980897A
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US2319464A
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US2780014A
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US3197894A
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US3286378A
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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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |