Patent US2428823A successfully refreshed from Google Patents.
US2428823A
Expired / Lapsed
US
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Method of producing drill bits
Assignee: MYRON OWEN W
•
Filing: 1943-05-18
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Granted: 1947-10-14
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Expires: 1963-05-18
Abstract
No abstract record available.
Inventors
- 👤 Marcus G Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:50
CPC Classifications
B; B23; B23P; B23P5/00; Y; Y10; Y10S; Y10S29/00; Y10S29/039; Y10S76/00; Y10S76/12; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986; Y10T29/51; Y10T29/5124; Y10T29/5127; Y10T29/5128
Claims Analysis
Total Claims: 0
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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) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |