Patent US3776222A successfully refreshed from Google Patents.
Patent US3803104A successfully refreshed from Google Patents.
US3803104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight and low viscosity vinylpyrrolidone polymer flocculants and catalyst and process producing the same
Assignee: ISP Investments LLC
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Filing: 1971-12-23
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Granted: 1974-04-09
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Expires: 1991-12-23
Abstract
Abstract NOVEL SOLUTION TETRAPOLYMER COMPOSITIONS CONSISTING OF MONOMER UNITS OF N-VINYL-2:PYRROLIDONE, ACRYLAMIDE, METHACRYLAMIDE, AND AN ALKYLAMINO-ESTER OF AN ETHYLENICALLY UNSATURATED ACID WHICH ARE SUITABLE FOR USE AS FLOCCULANTS HAVING A HIG MOLECULAR WEIGHT AND LOW SHEAR VISCOSITY ARE PRODUCED IN THE PRESENCE OF AN INORGANIC FREE RADICAL CATALYST SUCH AS TETRAPOTASSIUM PEROXY DIPHOSPHATE.
Inventors
- 👤 E Barabas
- 👤 F Grosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:06
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |