US2546756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Griscom Russell Co
•
Filing: 1949-05-14
•
Granted: 1951-03-27
•
Expires: 1969-05-14
Abstract
No abstract record available.
Inventors
- 👤 Eugene B Knowlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:43
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; Y; Y10; Y10T; Y10T29/00; Y10T29/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US705738A
Cited
US723685A
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US1514099A
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US1506988A
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US1601329A
Cited
US1752408A
Cited
US1917925A
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US2040440A
Cited
US2448512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |