US3235523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous solutions of polyacrylamide stabilized with thiourea
Assignee: Dow Chemical Co
•
Filing: 1961-10-25
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Granted: 1966-02-15
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Expires: 1981-10-25
Abstract
No abstract record available.
Inventors
- 👤 George F Schurz
- 👤 Keith R Mckennon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/39; C08K5/405
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A COMPOSITION OF A WATER-SOLUBLE ACRYLAMIDE POLYMER AND FROM ABOUT 0.1 TO ABOUT 7 PERCENT BY WEIGHT OF THIOUREA.
Claim 2
Dependent Claim
19 words
A COMPOSITION OF A WATER-SOLUBLE ACRYLAMIDE POLYMER AND FROM ABOUT 0.1 TO ABOUT 7 PERCENT BY WEIGHT OF THIOUREA.
References Cited (Backward Citations)
US2864803A
Cited
US3065193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |