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Patent US2231864A successfully refreshed from Google Patents.
US2231864A
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Attachment for drilling machines
Assignee: CORA B KORRER
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Filing: 1938-08-23
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Granted: 1941-02-18
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Expires: 1958-08-23
Abstract
No abstract record available.
Inventors
- 👤 Frank S Abel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:04
CPC Classifications
B; B23; B23B; B23B49/00; B23B49/003; B23B49/006; B23B49/008; B23B2260/00; B23B2260/088; Y; Y10; Y10T; Y10T408/00; Y10T408/21; Y10T408/55; Y10T408/564; Y10T408/5653; Y10T408/89; Y10T408/892; Y10T408/8925
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) | 1944-02-18 | 1944-08-19 | 1945-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-18 | 1948-08-19 | 1949-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-18 | 1952-08-19 | 1953-02-18 | $7700.00 | Window Closed / Lapsed |