Patent DE1952829U successfully refreshed from Google Patents.
Patent US2731323A successfully refreshed from Google Patents.
US2731323A
Expired / Lapsed
US
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Process of reacting cellulose textile with beta-propiolactone or beta-isovalerolactone
Assignee: Individual
•
Filing: 1953-11-20
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Granted: 1956-01-17
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Robert M Reinhardt
- 👤 George C Daul
- 👤 John D Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:29
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/224; D06M13/228
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS COMPRISING IMPREGNATING CELLULOSE TEXTILE FIBERS WITH AN AQUEOUS 5 TO 50 PER CENT ALKALI METAL HYDROXIDE SOLUTION, REACTING THE AQUEOUS ALKALI WET FIBERS WITH A LACTONE SELECTED FROM THE GROUP CONSISTING OF BETA-PROPIOLACTONE AND BETA-ISOVALEROLACTONE AT A TEMPERATURE FROM ABOUT 0* C. TO 30* C. UNTIL FIBERS ARE PRODUCED CONTAINING FROM ABOUT 0.5 TO 26%, BASED ON THE WEIGHT OF THE ORIGINAL FIBERS, OF THE LACTONE REACTION PRODUCTS COMBINED WITH THE CELLULOSE, AND REMOVING UNCOMBINED SUBSTANCES FROM THE RESULTING FIBERS.
Claim 2
Dependent Claim
82 words
A PROCESS COMPRISING IMPREGNATING CELLULOSE TEXTILE FIBERS WITH AN AQUEOUS 5 TO 50 PER CENT ALKALI METAL HYDROXIDE SOLUTION, REACTING THE AQUEOUS ALKALI WET FIBERS WITH A LACTONE SELECTED FROM THE GROUP CONSISTING OF BETA-PROPIOLACTONE AND BETA-ISOVALEROLACTONE AT A TEMPERATURE FROM ABOUT 0* C. TO 30* C. UNTIL FIBERS ARE PRODUCED CONTAINING FROM ABOUT 0.5 TO 26%, BASED ON THE WEIGHT OF THE ORIGINAL FIBERS, OF THE LACTONE REACTION PRODUCTS COMBINED WITH THE CELLULOSE, AND REMOVING UNCOMBINED SUBSTANCES FROM THE RESULTING FIBERS.
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) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |