US3451331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot roll supercalender
Assignee: Westvaco Corp
•
Filing: 1967-03-01
•
Granted: 1969-06-24
•
Expires: 1987-03-01
Abstract
No abstract record available.
Inventors
- 👤 John H Fredrickson
- 👤 Gunther K Hunger
- 👤 Harry F Kohne Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:20
CPC Classifications
D; D21; D21G; D21G1/00; D21G1/02; D21G1/0233; D21G1/0253; D21G1/0266; D21H; D21H25/00; D21H25/08; D21H25/12; D21H25/14; Y; Y10; Y10S; Y10S206/00; Y10S206/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1739572A
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US1714261A
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US2436530A
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US2599346A
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US2867414A
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US3091173A
Cited
US3230867A
Cited
US3190212A
Cited
US3364848A
Cited
US3336862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |