US4826932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dioxolane containing polymer
Assignee: Shell USA Inc
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Filing: 1987-12-29
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Granted: 1989-05-02
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Expires: 2007-12-29
Abstract
Abstract Reaction of a linear alternating copolymer of carbon monoxide and ethylene with a 1,2-dihydroxyalkane of up to 1 additional hydroxyl group produce polydioxolanes having dioxolane moieties attached to the polymer chain through a common carbon atom and furan moieties within the polymer chain.
Inventors
- 👤 Pui K. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:22
CPC Classifications
C; C08; C08G; C08G67/00; C08G67/02; C08F; C08F210/00; C08F210/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
The polydioxolane having recurring units of the formula ##STR9## wherein A is hydrogen or hydroxyl, n is an integer from 0 to 4 inclusive with the proviso that no more than one A can be hydroxyl, the ##STR10## units are less than 5% of the units of the polymer and the ratio of x:y is at least 2.
Claim 2
Dependent Claim
58 words
The polydioxolane having recurring units of the formula ##STR9## wherein A is hydrogen or hydroxyl, n is an integer from 0 to 4 inclusive with the proviso that no more than one A can be hydroxyl, the ##STR10## units are less than 5% of the units of the polymer and the ratio of x:y is at least 2.
Claim 3
Dependent Claim
23 words
The polydioxolane of claim 1 wherein the units ##STR11## are less than 2% of the units of the polymer and n is zero.
Claim 4
Dependent Claim
14 words
The polydioxolane of claim 2 wherein the ratio of x:y is at least 8.
Claim 5
Dependent Claim
29 words
The polydioxolane of claim 1 wherein, in a number of dioxolane units n is zero and in a number of dioxolane units A is hydroxyl and n is one.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |