Patent US1173665A successfully refreshed from Google Patents.
Patent US3312671A successfully refreshed from Google Patents.
US3312671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of 2-sodiosulfoethyl acrylate and acrylamide
Assignee: Dow Chemical Co
•
Filing: 1964-07-20
•
Granted: 1967-04-04
•
Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 David H Swisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:30
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F28/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A WATER-SOLUBLE ANIONIC POWDER OF ABOUT 80 TO 95 WEIGHT PERCENT 2-SODIOSULFOEHTYL ACRYLATE AND ABOUT 20 TO 5 WEIGHT PERCENT ACRYLAMIDE, SAID COPOLYMER BEING FURTHER CHARACTERIZED BY A VISCOSITY OF ABOUT 1.4 TO 5.0 CS. AT 100*F. AS A 0.1 PERCENT SOLUTION IN 5 PERCENT NACL BRINE.
Claim 2
Dependent Claim
47 words
A WATER-SOLUBLE ANIONIC POWDER OF ABOUT 80 TO 95 WEIGHT PERCENT 2-SODIOSULFOEHTYL ACRYLATE AND ABOUT 20 TO 5 WEIGHT PERCENT ACRYLAMIDE, SAID COPOLYMER BEING FURTHER CHARACTERIZED BY A VISCOSITY OF ABOUT 1.4 TO 5.0 CS. AT 100*F. AS A 0.1 PERCENT SOLUTION IN 5 PERCENT NACL BRINE.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |