US3453719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing diamond bits
Assignee: Shell USA Inc
•
Filing: 1967-03-06
•
Granted: 1969-07-08
•
Expires: 1987-03-06
Abstract
No abstract record available.
Inventors
- 👤 Robijn Feenstra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:07
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; E; E21; E21B; E21B10/00; E21B10/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2125332A
Cited
US2200281A
Cited
US2147843A
Cited
US2187384A
Cited
US2511991A
Cited
US3296693A
Cited
US3271822A
Cited
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 |