US2589258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrazobisalkanesulfonate poly-merization catalyst for ethylenically unsaturated monomers
Assignee: EIDP Inc
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Filing: 1950-02-01
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Granted: 1952-03-18
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Expires: 1970-02-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward G Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:50
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/04; Y; Y10; Y10S; Y10S526/00; Y10S526/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN THE AQUEOUS DISPERSION POLYMERIZATION AT TEMPERATURES WITHIN THE RANGE FROM -20* C. TO 60* C. OF AN ETHYLENICALLY UNSATURATED MONOMER SUBJECT TO ADDITION POLYMERIZATION, THE IMPROVEMENT WHEREIN SAID MONOMER IS POLYMERIZED BY BRINGING A DISPERSION OF SAID MONOMER IN CONTACT WITH (1) A POLYVALENT HEAVY METAL ION OF THE CLASS CONSISTING OF CUPRIC AND FERRIC IONS, (2) A PEROXIDE AND (3) A HYDRAZODISULFONATE ION
Claim 2
Dependent Claim
65 words
IN THE AQUEOUS DISPERSION POLYMERIZATION AT TEMPERATURES WITHIN THE RANGE FROM -20* C. TO 60* C. OF AN ETHYLENICALLY UNSATURATED MONOMER SUBJECT TO ADDITION POLYMERIZATION, THE IMPROVEMENT WHEREIN SAID MONOMER IS POLYMERIZED BY BRINGING A DISPERSION OF SAID MONOMER IN CONTACT WITH (1) A POLYVALENT HEAVY METAL ION OF THE CLASS CONSISTING OF CUPRIC AND FERRIC IONS, (2) A PEROXIDE AND (3) A HYDRAZODISULFONATE ION
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |