US3773720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyarylsulfones
Assignee: 3M Co
•
Filing: 1963-05-13
•
Granted: 1973-11-20
•
Expires: 1983-05-13
Abstract
Abstract 1. A THERMOPLASTIC, FILM- AND FIVER-FORMING CONDESATION POLYMER CONSISTING ESSENTIALLY OF REPEATING UNITS OF THE FORMULA Z<(-(1,2-PHENYLENE)-Y(N-1)-(5-((-)SO2-)-1,2-PHENYLENE)-) WHEREIN Y IS -O- OR -S-, N IS 1 OR 2, AND Z IS -O-, -S- OR -CH2-.
Inventors
- 👤 H Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:59
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A THERMOPLASTIC, FILM- AND FIVER-FORMING CONDESATION POLYMER CONSISTING ESSENTIALLY OF REPEATING UNITS OF THE FORMULA
Claim 2
Dependent Claim
15 words
A THERMOPLASTIC, FILM- AND FIVER-FORMING CONDESATION POLYMER CONSISTING ESSENTIALLY OF REPEATING UNITS OF THE FORMULA
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |