US2188631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trepanning drill
Assignee: Ingersoll Milling Machine Co
•
Filing: 1937-12-03
•
Granted: 1940-01-30
•
Expires: 1957-12-03
Abstract
No abstract record available.
Inventors
- 👤 Charles E Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:17
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/042; B23B51/0453; B23B2260/00; B23B2260/136; Y; Y10; Y10S; Y10S408/00; Y10S408/703; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/89; Y10T408/895; Y10T408/8957
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-01-29 | 1943-07-31 | 1944-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-29 | 1947-07-31 | 1948-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-29 | 1951-07-31 | 1952-01-30 | $7700.00 | Window Closed / Lapsed |