US3278474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of unsaturated aldehydes and quaternary ammonium compounds, derivatives thereof, preparation and use
Assignee: Shell USA Inc
•
Filing: 1962-06-20
•
Granted: 1966-10-11
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Expires: 1982-06-20
Abstract
No abstract record available.
Inventors
- 👤 Alan C Nixon
- 👤 Paul J Berrigan
- 👤 Paul H Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:24
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; C08G16/0231; C08G2/18; C08G2/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A WATER-SOLUBLE POLYSULFONIC ACID OBTAINED BY REACTING A COPOLYMER OF ACROLEIN AND ALYL TRIALKYL AMMONIUM CHLORIDE CONTAINING A TOTAL OF FROM 6 TO 24 CARBON ATOMS WITH SULFUR DIOXIDE.
Claim 2
Dependent Claim
12 words
A WATER SOLUTION OF THE WATER-SOLUBLE POLYSULFONIC ACID DEFINED IN CLAIM 8.
References Cited (Backward Citations)
US2676166A
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US2984639A
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US2884057A
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US2843573A
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US2884058A
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US2923701A
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US2893979A
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US2940955A
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US3079296A
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US3079280A
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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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |