Patent US3287329A successfully refreshed from Google Patents.
US3287329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulfones and processes for the preparation thereof
Assignee: Celanese Corp
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Filing: 1963-03-19
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Granted: 1966-11-22
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Expires: 1983-03-19
Abstract
No abstract record available.
Inventors
- 👤 Slovinsky Manuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A NORMALLY SOLID POLYSULFONE OF SULFUR DIOXIDE AND AT LEAST ONE COMPOUND HAVING A MONOETHYLENICALLY UNSATURATED FURAN RING, SAID POLYSULFONE CONSISTING ESSENTIALLY OF RECURRING -SO2- UNITS INTERSPERSED WITH RECURRING DIHYDROFURAN UNITS HAVING THE STRUCTURE
Claim 2
Dependent Claim
34 words
A NORMALLY SOLID POLYSULFONE OF SULFUR DIOXIDE AND AT LEAST ONE COMPOUND HAVING A MONOETHYLENICALLY UNSATURATED FURAN RING, SAID POLYSULFONE CONSISTING ESSENTIALLY OF RECURRING -SO2- UNITS INTERSPERSED WITH RECURRING DIHYDROFURAN UNITS HAVING THE STRUCTURE
References Cited (Backward Citations)
US2114292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |