Patent US3495670A successfully refreshed from Google Patents.
US3495670A
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Drill bit and method and apparatus for making same
Assignee: Ingersoll Rand Co
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Filing: 1968-09-16
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Granted: 1970-02-17
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Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 J D Ditson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
B; B21; B21K; B21K5/00; B21K5/02; B21K5/06; B21K25/00; E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49934; Y10T29/49945
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |