US3336274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly crystalline terpolymeric and quaterpolymeric polysulfones
Assignee: Shell USA Inc
•
Filing: 1965-02-11
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Granted: 1967-08-15
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Expires: 1985-02-11
Abstract
No abstract record available.
Inventors
- 👤 Edward A Youngman
- 👤 Ronald S Bauer
- 👤 Howard V Holler
- 👤 Hans E Lunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:08
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A NORMALLY SOLID, HYDROGENATED COPOLYMER OF (1) SULFUR DIOXIDE (2) BUTADIENE AND (3) AT LEAST ONE OF THE PENTADIENES ISOPRENE AND PIPERYLENE, WITH RECURRING CONSISTING ESSENTIALLY OF RECURRING -SO2- UNITS ALTERNATING WEITH RECURRING HYDROCARBON RADICALS DERIVED FROM ONE MOLECULE OF ONE OF SAID DIENES AND HAVING IN THE UNHYDROGENTATED STATE ONE ETHYLENICALLY UNSATURATED SITE PER DIENE UNIT, THE WEIGHT RATIO OF BUTADIENE-DERIVED TO PENTADIENE-DERIVED RADICALS BEING BETWEEN ABOUT 1:20 AND 20:1, RESPECTIVELY, AND THE RESIDUAL ETHYLENIC UNSATURATION IN SAID HYDROGENATED COPOLYMER BEING LESS THAN ABOUT 50%.
Claim 2
Dependent Claim
86 words
A NORMALLY SOLID, HYDROGENATED COPOLYMER OF (1) SULFUR DIOXIDE (2) BUTADIENE AND (3) AT LEAST ONE OF THE PENTADIENES ISOPRENE AND PIPERYLENE, WITH RECURRING CONSISTING ESSENTIALLY OF RECURRING -SO2- UNITS ALTERNATING WEITH RECURRING HYDROCARBON RADICALS DERIVED FROM ONE MOLECULE OF ONE OF SAID DIENES AND HAVING IN THE UNHYDROGENTATED STATE ONE ETHYLENICALLY UNSATURATED SITE PER DIENE UNIT, THE WEIGHT RATIO OF BUTADIENE-DERIVED TO PENTADIENE-DERIVED RADICALS BEING BETWEEN ABOUT 1:20 AND 20:1, RESPECTIVELY, AND THE RESIDUAL ETHYLENIC UNSATURATION IN SAID HYDROGENATED COPOLYMER BEING LESS THAN ABOUT 50%.
References Cited (Backward Citations)
US2293023A
Cited
US2625525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |