US2891426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of metal drilling
Assignee: RALPH W WALSH
•
Filing: 1958-10-23
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Granted: 1959-06-23
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Expires: 1978-10-23
Abstract
No abstract record available.
Inventors
- 👤 Earnest E Martin
- 👤 Ralph W Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:56
CPC Classifications
B; B23; B23B; B23B47/00; B23B47/34; B23Q; B23Q5/00; B23Q5/02; B23Q5/04; B23Q5/06; Y; Y10; Y10S; Y10S29/00; Y10S29/046; Y10T; Y10T29/00; Y10T29/49; Y10T29/49995; Y10T29/49996; Y10T408/00; Y10T408/03; Y10T408/65; Y10T408/675; Y10T409/00; Y10T409/30; Y10T409/303752
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) | 1962-06-22 | 1962-12-22 | 1963-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-22 | 1966-12-22 | 1967-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-22 | 1970-12-22 | 1971-06-23 | $7700.00 | Window Closed / Lapsed |