US3079357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high molecular weight polymers from acrolein and resulting products
Assignee: Shell USA Inc
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Filing: 1959-12-14
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Granted: 1963-02-26
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Expires: 1979-12-14
Abstract
No abstract record available.
Inventors
- 👤 Rudolph F Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:37
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/14; C08G2/30; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A SOLID INSOLUBLE HIGH MOLECULAR WEIGHT HOMOPOLYMER OF ACRLEIN HAVING AN INTRINSIC VISCOSITY AFTER SOLUBILIZATION WITH AQUEOUS SULFUR DIOXIDE OF AT LEAST 0.9 DL./G. AND POSSESSING AT LEAST 95% OF THE THEORETICAL ALDEHYDE FUNCTION AS DETERMINED BY ADDITION OF HYDROXYLAMINE HYDROCHLORIDE AND TITRATING WITH KARL FISCHER REAGENT THE LIBERATED WATER, WITH ALLOWANCE BEING FOR THE WATER ALREADY PRESENT IN THE POLYMER, THE EXPRESSION THEORETICAL ALDEHYDE AS USED ABOVE MEANING ONE ALDEHYDE GROUP PER UNIT OF ACROLEIN IN THE POLYMER.
Claim 2
Dependent Claim
79 words
A SOLID INSOLUBLE HIGH MOLECULAR WEIGHT HOMOPOLYMER OF ACRLEIN HAVING AN INTRINSIC VISCOSITY AFTER SOLUBILIZATION WITH AQUEOUS SULFUR DIOXIDE OF AT LEAST 0.9 DL./G. AND POSSESSING AT LEAST 95% OF THE THEORETICAL ALDEHYDE FUNCTION AS DETERMINED BY ADDITION OF HYDROXYLAMINE HYDROCHLORIDE AND TITRATING WITH KARL FISCHER REAGENT THE LIBERATED WATER, WITH ALLOWANCE BEING FOR THE WATER ALREADY PRESENT IN THE POLYMER, THE EXPRESSION THEORETICAL ALDEHYDE AS USED ABOVE MEANING ONE ALDEHYDE GROUP PER UNIT OF ACROLEIN IN THE POLYMER.
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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |