US2535919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sheets of webs of fibrous textile materials
Assignee: Akzo Nobel UK PLC
•
Filing: 1948-10-15
•
Granted: 1950-12-26
•
Expires: 1968-10-15
Abstract
No abstract record available.
Inventors
- 👤 Happey Frank
- 👤 Grimes John Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:26
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/552; D04H1/42; D04H1/425; D04H1/4258; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/188
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS FOR THE MANUFACTURE OF NON-WOVEN FABRICS WHICH COMPRISES THE STEPS OF ACETYLATING UNSPUN CEULLULOSE FIBERS WHILE MAINTAINING THEIR FIBER STRUCTURE UNTIL THE ACETYL CONTENT OF THE FIBERS IS FROM ABOUT 8 TO ABOUT 40 PER CENT, CALCULATED AS THE PERCENTAGE OF ACETIC ACID ON THE FINAL WEIGHT OF THE FIBERS, FORMING A FIBROUS WEB OF UNSPUN FIBERS AT LEAST THE MAJOR PROPORTION OF WHICH CONSISTS OF THE UNSPUN, INCOMPLETELYACETYLATED CELLULOSE FIBERS SO OBTAINED, AND RENDERING ADHESIVE THE CELLULOSE TRIACETATE PHASE OF THE UNSPUN INCOMPLETELY-ACETYLATED CELLULOSE FIBERS WHEREBY THE FIBERS IN THE WEB ARE BONDED TOGETHER AT THEIR POINTS OF CONTACT TO FORM A UNIFIED FIBROUS STRUCTURE.
Claim 2
Dependent Claim
108 words
A PROCESS FOR THE MANUFACTURE OF NON-WOVEN FABRICS WHICH COMPRISES THE STEPS OF ACETYLATING UNSPUN CEULLULOSE FIBERS WHILE MAINTAINING THEIR FIBER STRUCTURE UNTIL THE ACETYL CONTENT OF THE FIBERS IS FROM ABOUT 8 TO ABOUT 40 PER CENT, CALCULATED AS THE PERCENTAGE OF ACETIC ACID ON THE FINAL WEIGHT OF THE FIBERS, FORMING A FIBROUS WEB OF UNSPUN FIBERS AT LEAST THE MAJOR PROPORTION OF WHICH CONSISTS OF THE UNSPUN, INCOMPLETELYACETYLATED CELLULOSE FIBERS SO OBTAINED, AND RENDERING ADHESIVE THE CELLULOSE TRIACETATE PHASE OF THE UNSPUN INCOMPLETELY-ACETYLATED CELLULOSE FIBERS WHEREBY THE FIBERS IN THE WEB ARE BONDED TOGETHER AT THEIR POINTS OF CONTACT TO FORM A UNIFIED FIBROUS STRUCTURE.
References Cited (Backward Citations)
US2387354A
Cited
US2252999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |