Patent US2996479A successfully refreshed from Google Patents.
US2996479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polysiloxanes
Assignee: Union Carbide Corp
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Filing: 1954-04-30
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Granted: 1961-08-15
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Expires: 1974-04-30
Abstract
No abstract record available.
Inventors
- 👤 Samuel Sterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:12
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/38; C08G77/42; C08G77/445; C08G77/48; C08G77/50; C08L; C08L83/00; C09; C09D; C09D183/00; C09D183/04; C09D183/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A PROCESS FOR PREPARING MODIFIED POLYSILOXANES WHICH COMPRISES REACTING AN ORGANOPOLYSILOXANE HAVING A MOLECULAR WEIGHT OF FROM 400 TO 4000 AND HAVING (A) FROM 1.0 TO 1.6 SILICON-BONDED MONOVALENT HYDROCARBON GROUPS PER SILICON ATOM, SAID HYDROCARBON GROUPS BEING TAKEN FROM THE CLASS CONSISTING OF PHENYL AND METHYL GROUPS AND THE AMOUNT OF SAID SILICONBONDED METHYL GROUPS PRESENT VARYING FROM 0% TO ABOUT 40% OF THE AMOUNT OF SAID SILICON-BONDED PHENYL GROUPS, (B) SILICON BONDED HYDROCARBONOXY GROUPS, SAID HYDROCARBONOXY GROUPS BEING TAKEN FROM THE CLASS CONSISTING OF ALKOXY AND ARYLOXY GROUPS AND BEING PRESENT IN AN AMOUNT BY WEIGHT OF FROM ABOUT 5% TO ABOUT 40% OF THE TOTAL WEIGHT OF SAID ORGANOPOLYSILOXANES, WITH A BIS(HYDROXYALKYL) DICARBOXYLATE, SAID DICARBOXYLATE CONSISTING OF ONLY HYDROGEN, CARBON AND OXYGEN ATOMS AND CONTAINING A TOTAL OF FROM 8 TO ABOUT 18 CARBON ATOMS WHERE EACH OF THE HYDROXYALKYL PORTIONS OF SAID BIS(HYDOXYALKYL) DICARBOXYLATE CONTAINS FROM 2 TO 4 CARBON ATOMS, AT A TEMPERATURE OF FROM ABOUT 140*C. TO ABOUT 250*C. TO OBTAIN A MODIFIED POLYSILOXANE CONTAINING RESIDUAL HYDROCARBONOXY GROUPS.
Claim 2
Dependent Claim
174 words
A PROCESS FOR PREPARING MODIFIED POLYSILOXANES WHICH COMPRISES REACTING AN ORGANOPOLYSILOXANE HAVING A MOLECULAR WEIGHT OF FROM 400 TO 4000 AND HAVING (A) FROM 1.0 TO 1.6 SILICON-BONDED MONOVALENT HYDROCARBON GROUPS PER SILICON ATOM, SAID HYDROCARBON GROUPS BEING TAKEN FROM THE CLASS CONSISTING OF PHENYL AND METHYL GROUPS AND THE AMOUNT OF SAID SILICONBONDED METHYL GROUPS PRESENT VARYING FROM 0% TO ABOUT 40% OF THE AMOUNT OF SAID SILICON-BONDED PHENYL GROUPS, (B) SILICON BONDED HYDROCARBONOXY GROUPS, SAID HYDROCARBONOXY GROUPS BEING TAKEN FROM THE CLASS CONSISTING OF ALKOXY AND ARYLOXY GROUPS AND BEING PRESENT IN AN AMOUNT BY WEIGHT OF FROM ABOUT 5% TO ABOUT 40% OF THE TOTAL WEIGHT OF SAID ORGANOPOLYSILOXANES, WITH A BIS(HYDROXYALKYL) DICARBOXYLATE, SAID DICARBOXYLATE CONSISTING OF ONLY HYDROGEN, CARBON AND OXYGEN ATOMS AND CONTAINING A TOTAL OF FROM 8 TO ABOUT 18 CARBON ATOMS WHERE EACH OF THE HYDROXYALKYL PORTIONS OF SAID BIS(HYDOXYALKYL) DICARBOXYLATE CONTAINS FROM 2 TO 4 CARBON ATOMS, AT A TEMPERATURE OF FROM ABOUT 140*C. TO ABOUT 250*C. TO OBTAIN A MODIFIED POLYSILOXANE CONTAINING RESIDUAL HYDROCARBONOXY GROUPS.
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |