US2721784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of reacting cellulose fibers with beta-propiolactone
Assignee: Individual
•
Filing: 1952-07-18
•
Granted: 1955-10-25
•
Expires: 1972-07-18
Abstract
No abstract record available.
Inventors
- 👤 George C Daul
- 👤 Reid John David
- 👤 Robert M Reinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:39
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/224; D06M13/228; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS COMPRISING REACTING CELLULOSE FIBERS WITH BETA-PROPIOLACTONE AT ABOUT FROM 50* TO 155* C. UNTIL FIBERS AND PRODUCED CONTAINING FROM ABOUT 0.5 TO 26%, BASED ON THE WEIGHT OF THE ORIGINAL FIBERS, OF BETA-PROPIOLACTONE REACTION PRODUCTS COMBINED WITH THE CELLULOSE.
Claim 2
Dependent Claim
41 words
A PROCESS COMPRISING REACTING CELLULOSE FIBERS WITH BETA-PROPIOLACTONE AT ABOUT FROM 50* TO 155* C. UNTIL FIBERS AND PRODUCED CONTAINING FROM ABOUT 0.5 TO 26%, BASED ON THE WEIGHT OF THE ORIGINAL FIBERS, OF BETA-PROPIOLACTONE REACTION PRODUCTS COMBINED WITH THE CELLULOSE.
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) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |