US2568331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerization of styrene and unsaturated polyester
Assignee: Individual
•
Filing: 1947-06-26
•
Granted: 1951-09-18
•
Expires: 1967-06-26
Abstract
No abstract record available.
Inventors
- 👤 Vincent J Frilette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:35
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08F; C08F283/00; C08F283/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE PROCESS OF ACCELERATING THE CONJOINT POLYMERIZATION OF A MIXTURE COMPRISED OF A DIHYDRIC ALCOHOL POLYESTER OF AN ALPHA-ETHYLENICALLY UNSATURATED ALPHA-BETA DICARBOXYLIC ACID AND STYRENE BY ADDING TO THE MIXTURE AN ORGANIC PEROXIDE CATALYST AND A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE OXIDES AND HYDROXIDES OF MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM, SAID COMPOUND BEING ADDED IN AN AMOUNT EFFECTIVE TO ACCELERATE THE CONJOINT POLYMERIZATION WITHOUT THE APPLICATION OF EXTERNAL HEAT.
Claim 2
Dependent Claim
72 words
THE PROCESS OF ACCELERATING THE CONJOINT POLYMERIZATION OF A MIXTURE COMPRISED OF A DIHYDRIC ALCOHOL POLYESTER OF AN ALPHA-ETHYLENICALLY UNSATURATED ALPHA-BETA DICARBOXYLIC ACID AND STYRENE BY ADDING TO THE MIXTURE AN ORGANIC PEROXIDE CATALYST AND A COMPOUND SELECTED FROM THE CLASS CONSISTING OF THE OXIDES AND HYDROXIDES OF MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM, SAID COMPOUND BEING ADDED IN AN AMOUNT EFFECTIVE TO ACCELERATE THE CONJOINT POLYMERIZATION WITHOUT THE APPLICATION OF EXTERNAL HEAT.
References Cited (Backward Citations)
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US2549732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |