Patent US3669778A successfully refreshed from Google Patents.
US3669778A
Expired / Lapsed
US
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Method for the production of fibrous sheet materials
Assignee: Individual
•
Filing: 1970-02-03
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Granted: 1972-06-13
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Expires: 1990-02-03
Abstract
Abstract In the production of fibrous sheet materials by an air-laying process adjusting the moisture content of the fibrous layer at a value of at least 6% by weight and embossing said fibrous layer at a temperature of above 100 degrees C.
Inventors
- 👤 Torben Borup Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:18
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/552; D04H1/04; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |