Patent US3030342A successfully refreshed from Google Patents.
US3030342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Salts of styrene-maleic anhydride copolymers
Assignee: Beazer East Inc
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Filing: 1960-01-15
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Granted: 1962-04-17
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Expires: 1980-01-15
Abstract
No abstract record available.
Inventors
- 👤 Harlan E Tiefenthal
- 👤 Lee Yoon Chai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:51
CPC Classifications
C; C08; C08F; C08F8/00; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
METHOD OF MAKING A SOLID, WATER-SOLUBLE, SUBSTANTIALLY ESTER-FREE ALKALI METAL SALT OF A STYRENE-MALEIC ANHYDRIDE COPOLYMER COMPRISING ADMIXING A SLURRY OF STYRENE-MALEIC ANHYDRIDE COPOLYMER IN AN INERT ORGANIC MEDIUM CONTAINING UP TO 30% BY WEIGHT COPOLYMER SOLIDS SAID COPOLYMER HAVING A STYRENE TO MALEIC MOLE RATIO OF 1:1-5:4, WITH A SUBSTANTIALLY ANHYDROUS ALKALI METAL HYDROXIDE IN THE PRESENCE OF FROM ABOUT 0.5-5 PARTS BY WEIGHT OF A SECONDARY LOWER ALKANOL HAVING UP TO FIVE CARBON ATOMS BASED UPON THE WEIGHT OF SAID COPOLYMER, ALLOWING THE MIXING TO REACT AT A TEMPERATURE OF 25 TO 1320*C., WHEREBY SAID SOLID ALKALI METAL SALT IS FORMED, AND SEPARATING SAID SOLID SALT THEREFROM.
Claim 2
Dependent Claim
109 words
METHOD OF MAKING A SOLID, WATER-SOLUBLE, SUBSTANTIALLY ESTER-FREE ALKALI METAL SALT OF A STYRENE-MALEIC ANHYDRIDE COPOLYMER COMPRISING ADMIXING A SLURRY OF STYRENE-MALEIC ANHYDRIDE COPOLYMER IN AN INERT ORGANIC MEDIUM CONTAINING UP TO 30% BY WEIGHT COPOLYMER SOLIDS SAID COPOLYMER HAVING A STYRENE TO MALEIC MOLE RATIO OF 1:1-5:4, WITH A SUBSTANTIALLY ANHYDROUS ALKALI METAL HYDROXIDE IN THE PRESENCE OF FROM ABOUT 0.5-5 PARTS BY WEIGHT OF A SECONDARY LOWER ALKANOL HAVING UP TO FIVE CARBON ATOMS BASED UPON THE WEIGHT OF SAID COPOLYMER, ALLOWING THE MIXING TO REACT AT A TEMPERATURE OF 25 TO 1320*C., WHEREBY SAID SOLID ALKALI METAL SALT IS FORMED, AND SEPARATING SAID SOLID SALT THEREFROM.
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) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |