US2628215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenyl methyl dialkoxy silane-polyhydric alcohol-dicarboxylic acid or anhydride reaction
Assignee: Dow Silicones Corp
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Filing: 1949-09-28
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Granted: 1953-02-10
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Expires: 1969-09-28
Abstract
No abstract record available.
Inventors
- 👤 Melvin J Hunter
- 👤 Lawrence A Rauner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:13
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C08G77/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
THE METHOD OF PREPARING COPOLYMERIC MATERIALS WHICH COMPRISES REACTING A PHENYLMETHYLDIALKOXYSILANE WITH AN EQUAL MOLECULAR AMOUNT OF A DIHYDRIC ALCOHOL AND REACTING THE RESULTING PRODUCT AT A TEMPERATURE BETWEEN 100* C. AND 300* C., WITH AN ACIDIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS AND ANHYDRIDES THERE, IN AMOUNT SUCH THAT THE RATIO OF THE NUMBER OF ACID FUNDAMENTAL GROUPS TO THE SUM OF THE NUMBER OF ALKOXY RADICALS PLUS HYDROXYL RADICALS IS FROM 0.01 TO 1.
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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |