US2522491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubbery copolymer of butadiene and alpha-methyl 2, 4-dichlorostyrene
Assignee: Mathieson Chemical Corp
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Filing: 1946-07-19
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Granted: 1950-09-19
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Expires: 1966-07-19
Abstract
No abstract record available.
Inventors
- 👤 Charles C Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:21
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/16; C08F212/18; C08F236/00; C08F236/02; C08F236/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A RUBBERY COPOLYMER OF ALPHA-METHYL 2,4-DICHLOROSTYRENE AND BUTADIENE-1,3, PREPARED FROM ALPHA-METHYL 2,4-DICHLOROSTYRENE WHICH HAS BEEN PURIFIED BY FIRST AGITATING IT WITH A SOLUTION OF MERCURIC SULFATE IN DILUTE ACID, THEN WITH A CUPROUS CHLORIDE MIXTURE PREPARED BY ADDING CUPROUS CHLORIDE AND COPPER POWDER TO AMMONIA HYDROXIDE AND FINALLY WITH A SOLUTION OF POTASSIUM DICHROMATE IN SULFURIC ACID, SAID COPOLYMER CONTAINING 10-30% OF ALPHA-METHYL 2,4-DICHLOROSTYRENE AS DETERMINED BY CHLORINE ANALYSIS.
Claim 2
Dependent Claim
69 words
A RUBBERY COPOLYMER OF ALPHA-METHYL 2,4-DICHLOROSTYRENE AND BUTADIENE-1,3, PREPARED FROM ALPHA-METHYL 2,4-DICHLOROSTYRENE WHICH HAS BEEN PURIFIED BY FIRST AGITATING IT WITH A SOLUTION OF MERCURIC SULFATE IN DILUTE ACID, THEN WITH A CUPROUS CHLORIDE MIXTURE PREPARED BY ADDING CUPROUS CHLORIDE AND COPPER POWDER TO AMMONIA HYDROXIDE AND FINALLY WITH A SOLUTION OF POTASSIUM DICHROMATE IN SULFURIC ACID, SAID COPOLYMER CONTAINING 10-30% OF ALPHA-METHYL 2,4-DICHLOROSTYRENE AS DETERMINED BY CHLORINE ANALYSIS.
References Cited (Backward Citations)
US2384535A
Cited
GB570596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |