Patent US4131625A successfully refreshed from Google Patents.
US4131625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4'-Bis(3-ethynylphenoxy)diphenylsulfone
Assignee: United States Department of the Air Force
•
Filing: 1978-01-19
•
Granted: 1978-12-26
•
Expires: 1998-01-19
Abstract
Abstract The new composition 4,4'-bis(3-ethynylphenoxy)diphenylsulfone is prepared by the nucleophilic displacement reaction of m-hydroxy-phenyl acetylene with various disubstituted diphenylsulfones. The composition is useful as a composite resin and also as a reactive plasticizer for polysulfone thermoplastic resins. A reactive plasticizer is a material that remains fluid and acts as a plasticizer during early stages of fabrication and then polymerizes to a rigid resin.
Inventors
- 👤 Fred E. Arnold
- 👤 Gerard A. Loughran
- 👤 Anthony Wereta, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:55
CPC Classifications
C; C07; C07C; C07C317/00; C07C317/16; C07C317/22; C07C309/00; C07C309/63; C07C309/72; C07C309/73; C08; C08K; C08K5/00; C08K5/36; C08K5/41; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
4,4'-Bis(3-ethynylphenoxy)diphenylsulfone.
Claim 2
Dependent Claim
1 words
4,4'-Bis(3-ethynylphenoxy)diphenylsulfone.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |