Patent US2828131A successfully refreshed from Google Patents.
US2828131A
Expired / Lapsed
US
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Magnetic drill chuck assembly
Assignee: Individual
•
Filing: 1953-12-11
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Granted: 1958-03-25
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Expires: 1973-12-11
Abstract
No abstract record available.
Inventors
- 👤 David K Appleby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:03
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/08; B23B31/24; B23B31/28; B23B2270/00; B23B2270/38; Y; Y10; Y10T; Y10T24/00; Y10T24/32; Y10T279/00; Y10T279/17; Y10T279/17017; Y10T279/23; Y10T279/34; Y10T279/3406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE491920C
Cited
US1369491A
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US1398679A
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US1523770A
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US2147204A
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DE697868C
Cited
US2360928A
Cited
US2297064A
Cited
US2399808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |