Patent US2273845A successfully refreshed from Google Patents.
US2273845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indexable reversible chuck mechanism
Assignee: Devlieg Bullard Inc
•
Filing: 1940-01-30
•
Granted: 1942-02-24
•
Expires: 1960-01-30
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Drissner
- 👤 William J Hogg
- 👤 Kenneth W Barkinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:22
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/16; B23B31/1612; B23B31/16141; B23B31/34; B23G; B23G7/00; Y; Y10; Y10T; Y10T279/00; Y10T279/12; Y10T279/1241; Y10T279/17; Y10T279/17666; Y10T279/17692; Y10T279/17717; Y10T29/00; Y10T29/51; Y10T29/5152; Y10T29/5165; Y10T74/00; Y10T74/14; Y10T74/1418; Y10T74/1424; Y10T74/1453
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1945-02-23 | 1945-08-25 | 1946-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-23 | 1949-08-25 | 1950-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-23 | 1953-08-25 | 1954-02-24 | $7700.00 | Window Closed / Lapsed |