Patent US2579844A successfully refreshed from Google Patents.
Patent US2604468A successfully refreshed from Google Patents.
US2604468A
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Chlorite-sulfite redox-initiated aqueous polymerization of vinyl chloride
Assignee: Diamond Shamrock Corp
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Filing: 1950-11-06
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Granted: 1952-07-22
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Expires: 1970-11-06
Abstract
No abstract record available.
Inventors
- 👤 Julius E Underwood
- 👤 Hill Archie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:25
CPC Classifications
C; C08; C08F; C08F114/00; C08F114/02; C08F114/04; C08F114/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE METHOD OF POLYMERIZING MONOMERIC VINYL CHLORIDE WHICH INCLUDES THE STEPS OF DISPERSING MONOMERIC VINYL CHLORIDE INAN AQUEOUS ACIDIC MEDIUM CONTAINING SULFITE IONS AND CHLORITE IONS, SAID SULFITE IONS BEING IN EXCESS OF THE EQUIVALENT MOLECULAR PROPORTION OF SAID CHLORITE IONS, AND RECOVERING A VINYL CHLORIDE POLYMERIZATE FROM SAID MEDIUM.
Claim 2
Independent Claim
50 words
THE METHOD OF POLYMERIZING MONOMERIC VINYL CHLORIDE WHICH INCLUDES THE STEPS OF DISPERSING MONOMERIC VINYL CHLORIDE INAN AQUEOUS ACIDIC MEDIUM CONTAINING SULFITE IONS AND CHLORITE IONS, SAID SULFITE IONS BEING IN EXCESS OF THE EQUIVALENT MOLECULAR PROPORTION OF SAID CHLORITE IONS, AND RECOVERING A VINYL CHLORIDE POLYMERIZATE FROM SAID MEDIUM.
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) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |