US3476446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock bit and bearing
Assignee: Smith International Inc
•
Filing: 1967-06-08
•
Granted: 1969-11-04
•
Expires: 1987-06-08
Abstract
No abstract record available.
Inventors
- 👤 William J Neilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; F; F16; F16C; F16C17/00; F16C17/12; F16C17/18; F16C2352/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA561503A
Cited
US824628A
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US901866A
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US1483903A
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US1636499A
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GB430191A
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US2106860A
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US2104819A
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GB614121A
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FR987163A
Cited
US3086826A
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US3076683A
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US3131977A
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US3235316A
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US3348887A
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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) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |