Patent US2446548A successfully refreshed from Google Patents.
US2446548A
Expired / Lapsed
US
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Contact roll construction
Assignee: Individual
•
Filing: 1944-01-24
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Granted: 1948-08-10
•
Expires: 1964-01-24
Abstract
No abstract record available.
Inventors
- 👤 John S Nachtman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:06
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/06; C25D7/0614; C25D7/0657
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US338197A
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US1246825A
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US1330177A
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GB237863A
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US1572583A
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US1648921A
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US1778628A
Cited
US1991817A
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US2162692A
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US2266347A
Cited
US2271735A
Cited
US2293378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-10 | 1952-02-09 | 1952-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-10 | 1956-02-09 | 1956-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-10 | 1960-02-09 | 1960-08-10 | $7700.00 | Window Closed / Lapsed |