US2645588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane silica composition
Assignee: Dow Silicones Corp
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Filing: 1950-03-09
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Granted: 1953-07-14
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Expires: 1970-03-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:43
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A COMPOSITION OF MATTER HAVING THE CONSISTENCY OF GREASE AND CONSISTING ESSENTIALLY OF A FLUID POLYSILOXANE OF AT LEAST 50 CS. VISCOSITY AT 25* C., SAID SILOXANE HAVING FROM 1.9 TO 2.1 HYDROCARBON RADICALS PER SILICON ATOM, SAID RADICALS BEING SELECTED FROM THE GROUP CONSISTING OF METHYL AND PHENYL RADICALS, AT LEAST 50 PER CENT THEREOF BEING METHYL RADICALS, AND FROM 1 PER CENT TO 35 PER CENT BY WEIGHT SIO2 BASED UPON THE WEIGHT OF THE COMPOSITION, SAID COMPOSITION HAVING BEEN PREPARED BY THE STEPS COMPRISING REPLACING THE WATER IN A SILICA HYDROGEL WITH A WATER-MISCIBLE ORGANIC SOLVENT, AND THEREAFTER REPLACING ESSENTIALLY ALL OF THE SOLVENT IN THE GEL WITH THE SILOXANE.
Claim 2
Dependent Claim
113 words
A COMPOSITION OF MATTER HAVING THE CONSISTENCY OF GREASE AND CONSISTING ESSENTIALLY OF A FLUID POLYSILOXANE OF AT LEAST 50 CS. VISCOSITY AT 25* C., SAID SILOXANE HAVING FROM 1.9 TO 2.1 HYDROCARBON RADICALS PER SILICON ATOM, SAID RADICALS BEING SELECTED FROM THE GROUP CONSISTING OF METHYL AND PHENYL RADICALS, AT LEAST 50 PER CENT THEREOF BEING METHYL RADICALS, AND FROM 1 PER CENT TO 35 PER CENT BY WEIGHT SIO2 BASED UPON THE WEIGHT OF THE COMPOSITION, SAID COMPOSITION HAVING BEEN PREPARED BY THE STEPS COMPRISING REPLACING THE WATER IN A SILICA HYDROGEL WITH A WATER-MISCIBLE ORGANIC SOLVENT, AND THEREAFTER REPLACING ESSENTIALLY ALL OF THE SOLVENT IN THE GEL WITH THE SILOXANE.
References Cited (Backward Citations)
US2441422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |