Patent US2808394A successfully refreshed from Google Patents.
US2808394A
Expired / Lapsed
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Process for preparing polysulfonamides
Assignee: EIDP Inc
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Filing: 1951-10-23
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Granted: 1957-10-01
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Expires: 1971-10-23
Abstract
No abstract record available.
Inventors
- 👤 Stanley B Speck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:53
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR PREPARING A FIBER-FORMING POLYSULFOAMIDE WHICH COMPRISES ADDING SIMULTANEOUSLY, TO A WELL AGITATED AQUEOUS DISPERSION OF A DIPRIMARY ALIPHATIC DIAMINE CONTAINING AT LEAST 2 CARBON ATOMS, THE SAID DISPERSION CONTAINING AT LEAST ABOUT 80 PARTS OF WATER TO EACH 0.026 MOL PARTS OF DIAMINE, (A) A SOLUTION OF AN ORGANIC DISULFONY HALIDE IN A WATER-IMMISCIBLE SOLVENT AND (B) AN AQUEOUS SOLIUTION OF ACID ACCEPTOR TO NEUTRALIZE HYDROGEN HALIDE AS FORMED, THE REACTION MASS BEING MAINTAINED BETWEEN ABOUT-10*C. AND +60*C.
Claim 2
Dependent Claim
81 words
A PROCESS FOR PREPARING A FIBER-FORMING POLYSULFOAMIDE WHICH COMPRISES ADDING SIMULTANEOUSLY, TO A WELL AGITATED AQUEOUS DISPERSION OF A DIPRIMARY ALIPHATIC DIAMINE CONTAINING AT LEAST 2 CARBON ATOMS, THE SAID DISPERSION CONTAINING AT LEAST ABOUT 80 PARTS OF WATER TO EACH 0.026 MOL PARTS OF DIAMINE, (A) A SOLUTION OF AN ORGANIC DISULFONY HALIDE IN A WATER-IMMISCIBLE SOLVENT AND (B) AN AQUEOUS SOLIUTION OF ACID ACCEPTOR TO NEUTRALIZE HYDROGEN HALIDE AS FORMED, THE REACTION MASS BEING MAINTAINED BETWEEN ABOUT-10*C. AND +60*C.
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |