Patent US3433331A successfully refreshed from Google Patents.
US3433331A
Expired / Lapsed
US
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Diamond drill bit
Assignee: JK Smit and Sons Diamond Tools Ltd
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Filing: 1967-05-22
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Granted: 1969-03-18
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Expires: 1987-05-22
Abstract
No abstract record available.
Inventors
- 👤 Werner Heyberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:01
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/20; E21B10/18; E21B10/46; E21B10/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2054255A
Cited
US2256092A
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US2738166A
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US3100543A
Cited
US2975849A
Cited
US3055443A
Cited
US3095049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |