US2559155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polymers of acrylonitrile
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-01-30
•
Granted: 1951-07-03
•
Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Earl C Chapin
- 👤 George E Ham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:22
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A METHOD OF PREPARING COPOLYMERS WHICH COMPRISES CONTINUOUSLY ADDING FROM 30 TO 98 PERCENT BY WEIGHT OF ACRYLONITRILE AND FROM 70 TO TWO PERCENT OF A COMPOUND OF THE GROUP CONSISTING OF STYRENE AND ALPHA-METHYL-STYRENE TO AN AQUEOUS MEDIUM CONTAINING A PEROXY CATALYST AT THE REFLUX TEMPERATURE, SAID ADDITION BEING MADE AT RATES SUCH THAT THE REFLUX TEMPERATURE REMAINED CONSTANT.
Claim 2
Independent Claim
60 words
A METHOD OF PREPARING COPOLYMERS WHICH COMPRISES CONTINUOUSLY ADDING FROM 30 TO 98 PERCENT BY WEIGHT OF ACRYLONITRILE AND FROM 70 TO TWO PERCENT OF A COMPOUND OF THE GROUP CONSISTING OF STYRENE AND ALPHA-METHYL-STYRENE TO AN AQUEOUS MEDIUM CONTAINING A PEROXY CATALYST AT THE REFLUX TEMPERATURE, SAID ADDITION BEING MADE AT RATES SUCH THAT THE REFLUX TEMPERATURE REMAINED CONSTANT.
References Cited (Backward Citations)
US2100900A
Cited
US2420330A
Cited
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 |