US2541137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane elastomers
Assignee: Dow Silicones Corp
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Filing: 1949-04-07
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Granted: 1951-02-13
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Expires: 1969-04-07
Abstract
No abstract record available.
Inventors
- 👤 Earl L Warrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:56
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08G; C08G77/00; C08G77/04; C08K3/00; C08K3/34; C08K3/36; C08L; C08L83/00; C08L83/04; C08G77/42; C08G77/44; C08G77/70; Y; Y10; Y10S; Y10S273/00; Y10S273/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A METHOD OF PREPARING A DIORGANOSILOXANE ELASTOMER WHICH COMPRISES COMPOUNDING A BENZENE SOLUBLE DIORGANOPOLYSILOXANE IN WHICH THE STRUCTURAL UNITS ARE R2SIO WHERE R IS SELECTED FROM THE GROUP CONSISTING OF METHYL, PHENYL AND SILICONEOPENTYL RADICALS, AND IN WHICH SILOXANE AT LEAST 90% OF THE TOTAL NUMBER OF R GROUPS ARE METHYL RADICALS, SAID POLYSILOXANE HAVING A PENETROMETER READING OF LESS THAN 380 AFTER 10 SECONDS AT 25* C. IN ACCORDANCE WITH ASTM, D-21744T, A SILICA FILLER IN AMOUNT FROM 20 TO 50 PARTS BY WEIGHT FILLER PER 100 PARTS BY WEIGHT POLYSILOXANE, SAID SILICA HAVING A PORE VOLUME OF AT LEAST 4 CC. PER GRAM AND A HEAT OF WETTING BY WATER OF FROM 0.3 TO 1.0 CALORY PER CC. OF PORE VOLUME, AND FROM 1.5 TO 6 PARTS BY WEIGHT BASED UPON THE WEIGHT OF THE SILOXANE OF A VULCANIZING AGENT SELECTED FROM THE GROUP CONSISTING OF BENZOYL PEROXIDE AND TERTIARY BUTYL PERBENZOATE, AND HEATING THE COMPOUND MATERIAL AT A TEMPERATURE ABOVE 110* C. UNTIL A COHERENT, NONTACKY, RUBBERY PRODUCT IS OBTAINED.
Claim 2
Independent Claim
173 words
A METHOD OF PREPARING A DIORGANOSILOXANE ELASTOMER WHICH COMPRISES COMPOUNDING A BENZENE SOLUBLE DIORGANOPOLYSILOXANE IN WHICH THE STRUCTURAL UNITS ARE R2SIO WHERE R IS SELECTED FROM THE GROUP CONSISTING OF METHYL, PHENYL AND SILICONEOPENTYL RADICALS, AND IN WHICH SILOXANE AT LEAST 90% OF THE TOTAL NUMBER OF R GROUPS ARE METHYL RADICALS, SAID POLYSILOXANE HAVING A PENETROMETER READING OF LESS THAN 380 AFTER 10 SECONDS AT 25* C. IN ACCORDANCE WITH ASTM, D-21744T, A SILICA FILLER IN AMOUNT FROM 20 TO 50 PARTS BY WEIGHT FILLER PER 100 PARTS BY WEIGHT POLYSILOXANE, SAID SILICA HAVING A PORE VOLUME OF AT LEAST 4 CC. PER GRAM AND A HEAT OF WETTING BY WATER OF FROM 0.3 TO 1.0 CALORY PER CC. OF PORE VOLUME, AND FROM 1.5 TO 6 PARTS BY WEIGHT BASED UPON THE WEIGHT OF THE SILOXANE OF A VULCANIZING AGENT SELECTED FROM THE GROUP CONSISTING OF BENZOYL PEROXIDE AND TERTIARY BUTYL PERBENZOATE, AND HEATING THE COMPOUND MATERIAL AT A TEMPERATURE ABOVE 110* C. UNTIL A COHERENT, NONTACKY, RUBBERY PRODUCT IS OBTAINED.
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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |