Patent US2750358A successfully refreshed from Google Patents.
US2750358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl sulfonamides and process for preparing the same
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-03-06
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Granted: 1956-06-12
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Expires: 1973-03-06
Abstract
No abstract record available.
Inventors
- 👤 Harold F Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:32
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR PREPARING POLYVINYL SULFONAMIDE WHICH COMPRISES FIRST FORMING POLYVINYL AMMONIUM SULFONATE BY REACTING POLYVINYL CHLORIDE IN SUSPENSION IN A MIXTURE OF WATER AND A SWELLING AGENT FOR THE POLYVINYL CHLORIDE WITH AT LEAST ONE MOL OF AMMONIUM SULFITE PER MOL OF COMBINED CHLORINE IN THE POLYVINYL CHLORIDE AND THEN DEHYDRATING SAID POLYVINYL AMMONIUM SULFONATE AT A POLYVINYL SULFONAMIDE-FORMING TEMPERATURE IN THE PRESENCE OF A DEHYDRATION CATALYST TAKEN FROM THE GROUP CONSISTING OF PHOSPHOROUS PENTOXIDE, MAGNESIUM PERCHLORATE, ALUMINUM OXIDE, THORIUM OXIDE, CHROMIC OXIDE AND TUNGSTEN, PENTOXIDE WHILE SAID POLYVINYL AMMONIUM SULFONATE IS IN ADMIXTURE WITH A MINOR AMOUNT OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF SULFUR, MONOAND DICYCLIC, MONO- AND POLYHYDROXY, UNSUBSTITUTED, ALKYL AND HALOGEN-SUBSTITUTED PHENOLS.
Claim 2
Dependent Claim
119 words
A PROCESS FOR PREPARING POLYVINYL SULFONAMIDE WHICH COMPRISES FIRST FORMING POLYVINYL AMMONIUM SULFONATE BY REACTING POLYVINYL CHLORIDE IN SUSPENSION IN A MIXTURE OF WATER AND A SWELLING AGENT FOR THE POLYVINYL CHLORIDE WITH AT LEAST ONE MOL OF AMMONIUM SULFITE PER MOL OF COMBINED CHLORINE IN THE POLYVINYL CHLORIDE AND THEN DEHYDRATING SAID POLYVINYL AMMONIUM SULFONATE AT A POLYVINYL SULFONAMIDE-FORMING TEMPERATURE IN THE PRESENCE OF A DEHYDRATION CATALYST TAKEN FROM THE GROUP CONSISTING OF PHOSPHOROUS PENTOXIDE, MAGNESIUM PERCHLORATE, ALUMINUM OXIDE, THORIUM OXIDE, CHROMIC OXIDE AND TUNGSTEN, PENTOXIDE WHILE SAID POLYVINYL AMMONIUM SULFONATE IS IN ADMIXTURE WITH A MINOR AMOUNT OF A COMPOUND TAKEN FROM THE GROUP CONSISTING OF SULFUR, MONOAND DICYCLIC, MONO- AND POLYHYDROXY, UNSUBSTITUTED, ALKYL AND HALOGEN-SUBSTITUTED PHENOLS.
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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |