Patent US3231538A successfully refreshed from Google Patents.
US3231538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrolein terpolymer
Assignee: Shell USA Inc
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Filing: 1960-12-23
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Granted: 1966-01-25
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Expires: 1980-12-23
Abstract
No abstract record available.
Inventors
- 👤 William T Tsatsos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:53
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08F; C08F16/00; C08F16/34; C08F216/00; C08F216/34; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F246/00; C08F36/00; C08F36/02; C08F36/04; C08G2/18; C08G2/26; D; D06; D06M; D06M15/00; D06M15/693; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A HIGH MOLECULAR WEIGHT TERPOLYMER OF (1) ACROLEIN, (2) A POLYETHYLENICALLY UNSATURATED MONOMER, AND (3) A DISSIMILAR ETHYLENICALLY UNSATURATED MONOMER CONTAINING THE CH2=C= GROUP, SAID TERPOLYMER HAVING AN INTRINSIC VISCOSITY OF BETWEEN 0.5 AND 5.0 DL./G. AND THE AMOUNT OF ACROLEIN VARIES FROM 2% TO 90% BY WEIGHT OF MONOMERS BEING POLYMERIZED.
Claim 2
Dependent Claim
52 words
A HIGH MOLECULAR WEIGHT TERPOLYMER OF (1) ACROLEIN, (2) A POLYETHYLENICALLY UNSATURATED MONOMER, AND (3) A DISSIMILAR ETHYLENICALLY UNSATURATED MONOMER CONTAINING THE CH2=C= GROUP, SAID TERPOLYMER HAVING AN INTRINSIC VISCOSITY OF BETWEEN 0.5 AND 5.0 DL./G. AND THE AMOUNT OF ACROLEIN VARIES FROM 2% TO 90% BY WEIGHT OF MONOMERS BEING POLYMERIZED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |