US2237901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill
Assignee: Individual
•
Filing: 1938-10-07
•
Granted: 1941-04-08
•
Expires: 1958-10-07
Abstract
No abstract record available.
Inventors
- 👤 William A Chun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:44
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0006; B23B51/0007; B23B51/10; B23B51/107; B23B51/0002; B23B51/0003; B23B51/00035; B23B51/009; B23B51/02; B23B2250/00; B23B2250/12; B23B2251/00; B23B2251/50; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1908; Y10T407/192; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/89; Y10T408/905; Y10T408/909; Y10T408/9098; Y10T408/90993
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) | 1944-04-07 | 1944-10-07 | 1945-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-07 | 1948-10-07 | 1949-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-07 | 1952-10-07 | 1953-04-08 | $7700.00 | Window Closed / Lapsed |