Patent US5101480A successfully refreshed from Google Patents.
Patent US4375754A successfully refreshed from Google Patents.
Patent US3095404A successfully refreshed from Google Patents.
US3095404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high viscosity watersoluble polycationics
Assignee: Hercules Powder Co
•
Filing: 1959-04-07
•
Granted: 1963-06-25
•
Expires: 1979-04-07
Abstract
No abstract record available.
Inventors
- 👤 Dwight C Lincoln
- 👤 Walter P Shyluk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/62; C08F16/00; C08F16/12; C08F2/00; C08F2/04; C08F2/10; C08F2/32; C08F26/00; C08F26/06; C08F26/08; C08F28/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A PROCESS OF PREPARING WATER-SOLUBLE POLYMERS WHICH COMPRISES DISSOLVING A WATER-SOLUBLE MONOMERIC VINYL PYRIDIUM SALT IN A SOLVENT THEREFOR TO A CONCENTRATION OF ABOUT 65%-85% BY WEIGHT OF THE MONOMER, AND ALLOWING THE MONOMER TO POLYMERIZE AT 0*C.-25*C., SAID SALT BEING THE REACTION PRODUCT OF A 2-METHYL-5-VINYL PYRIDING AND DIMETHYL SULFATE, SAID POLYMERS HAVING A REDUCED SPECIFIC VISCOSITY OF AT LEAST ABOUT 7 AS MEASURED ON 0.5% SOLUTIONS THEREOF IN 0.2 MOLAR AQUEOUS SODIUM CHLORIDE.
Claim 2
Dependent Claim
75 words
A PROCESS OF PREPARING WATER-SOLUBLE POLYMERS WHICH COMPRISES DISSOLVING A WATER-SOLUBLE MONOMERIC VINYL PYRIDIUM SALT IN A SOLVENT THEREFOR TO A CONCENTRATION OF ABOUT 65%-85% BY WEIGHT OF THE MONOMER, AND ALLOWING THE MONOMER TO POLYMERIZE AT 0*C.-25*C., SAID SALT BEING THE REACTION PRODUCT OF A 2-METHYL-5-VINYL PYRIDING AND DIMETHYL SULFATE, SAID POLYMERS HAVING A REDUCED SPECIFIC VISCOSITY OF AT LEAST ABOUT 7 AS MEASURED ON 0.5% SOLUTIONS THEREOF IN 0.2 MOLAR AQUEOUS SODIUM CHLORIDE.
Claim 3
Dependent Claim
95 words
PROCESS OF PREPARING WATER-SOLUBLE POLYMERS WHICH COMPRISES DISSOLVING A MONOMERIC VINYL PYRIDINIUM SALT IN WATER TO A CONCENTRATION OF ABOUT 65%-85% AND DISSOLVING IN THE WATER 0.001%-0.0008% OF POTASSIUM PERSULFATE AS POLYMERIZATION CATALYST THEREFOR, AND ALLOWING THE MONOMER TO POLYMERIZE AT 0*C-325 C. IN THE SUBSTANTIAL ABSENCE OF AIR, ALL PERCENTAGES BEING BY WEIGHT BASED ON THE MONOMER, SAID SLAT BEING THE REACTION PROUCT OF A 2-METHYL-5-VINYL PYRIDINE AND DIMETHYL SULFATE, SAID POLYMERS HAVING A REDUCED SPECIFIC VISCOSITY OF AT LEAST ABOUT 7 AS MEASURED ON 0.5% SOLUTIONS THEREOF IN 0.2 MOLAR AQUEOUS SODIUM CHLORIDE.
Claim 4
Dependent Claim
95 words
PROCESS OF PREPARING WATER-SOLUBLE POLYMERS WHICH COMPRISES DISSOLVING A MONOMERIC VINYL PYRIDINIUM SALT IN WATER TO A CONCENTRATION OF ABOUT 65%-85% AND DISSOLVING IN THE WATER 0.001%-0.0008% OF POTASSIUM PERSULFATE AS POLYMERIZATION CATALYST THEREFOR, AND ALLOWING THE MONOMER TO POLYMERIZE AT 0*C-325 C. IN THE SUBSTANTIAL ABSENCE OF AIR, ALL PERCENTAGES BEING BY WEIGHT BASED ON THE MONOMER, SAID SLAT BEING THE REACTION PROUCT OF A 2-METHYL-5-VINYL PYRIDINE AND DIMETHYL SULFATE, SAID POLYMERS HAVING A REDUCED SPECIFIC VISCOSITY OF AT LEAST ABOUT 7 AS MEASURED ON 0.5% SOLUTIONS THEREOF IN 0.2 MOLAR AQUEOUS SODIUM CHLORIDE.
References Cited (Backward Citations)
CA484309A
Cited
US2811510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-24 | 1966-12-24 | 1967-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-24 | 1970-12-24 | 1971-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-24 | 1974-12-24 | 1975-06-25 | $7700.00 | Window Closed / Lapsed |