Patent US2423880A successfully refreshed from Google Patents.
US2423880A
Expired / Lapsed
US
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Method of making ball bearings
Assignee: Hartford National Bank and Trust Co
•
Filing: 1940-06-13
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Granted: 1947-07-15
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Expires: 1960-06-13
Abstract
No abstract record available.
Inventors
- 👤 Graaf Jacob Engel De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/02; C23C24/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49702
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US330389A
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US1176603A
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US1658173A
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US2004708A
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DE578433C
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US2143723A
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US2075518A
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US2158461A
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US2304371A
Cited
US2315280A
Cited
US2293037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |