US2559154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing copolymers of acrylonitrile
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-01-30
•
Granted: 1951-07-03
•
Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 George E Ham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF PREPARING EMULSION COPOLYMERS OF MORE THAN 40 PERCENT BY WEIGHT ACRYLONITRILE AND AT LEAST TWO PERCENT VINYL ACETATE WHICH COMPRISES ADDING THE MONOMERS IN THE PROPORTIONS DESIRED IN THE COPOLYMER, TO AN AQUEOUS MEDIUM CONTAINING A PEROXY CATALYST AND AN EMULSIFYING AGENT AT THE REFLEX TEMPERATURE, SAID ADDITION BEING MADE AT RATES SUCH THAT THE REFLUX TEMPERATURE REMAINS CONSTANT.
Claim 2
Independent Claim
62 words
A METHOD OF PREPARING EMULSION COPOLYMERS OF MORE THAN 40 PERCENT BY WEIGHT ACRYLONITRILE AND AT LEAST TWO PERCENT VINYL ACETATE WHICH COMPRISES ADDING THE MONOMERS IN THE PROPORTIONS DESIRED IN THE COPOLYMER, TO AN AQUEOUS MEDIUM CONTAINING A PEROXY CATALYST AND AN EMULSIFYING AGENT AT THE REFLEX TEMPERATURE, SAID ADDITION BEING MADE AT RATES SUCH THAT THE REFLUX TEMPERATURE REMAINS CONSTANT.
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) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |