Patent US2785147A successfully refreshed from Google Patents.
US2785147A
Expired / Lapsed
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Process for making octamethylcyclotetrasiloxane gels
Assignee: General Electric Co
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Filing: 1954-05-11
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Granted: 1957-03-12
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Expires: 1974-05-11
Abstract
No abstract record available.
Inventors
- 👤 Simon W Kantor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:13
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE PROCESS OF PREPARING AN ORGANOPOLYSILOXANE ELASTOMER WHICH COMPRISES (1) EFFECTING REACTION BETWEEM OCTAMETHYLCYCLOTETRASILOXANE AND FROM 0.2 TO 20 PERCENT BY WEIGHT OF AN ACYL PEROXIDE TO CONVERT A PORTION OF THE OCTAMETHYLCYCLOTERTASILOXANE TO 1,2-BIS-HEPTAMETHYLCYCLOTETRASILOXANYL-ETHANE, (2) REMOVING THE DECOMPOSITION PRODUCTS OF THE AFORESAID ACYL PEROXIDE BY CONTACTING THE REACTION PRODUCTS OF (1) WITH AN ADSORBENT MATERIAL, (3) REMOVING SAID ABSORBENT MATERIAL TO YELD A MIXTURE CONSISTING ESSENTIALLY OF OCTAMETHYLCYCLOTETRASILOXANE AND 1,2-BIS-HEPTAMETHYLCYCLOTETRASILOXANYL-ETHANE, AND (4) POLYMERIZING SAID MIXTURE BY CONTACT WITH A CATALYTIC AMOUNT OF AN ORGANOPOLYSILOXANE REARRANGEMENT AND CONDENSATION CATALYST.
Claim 2
Dependent Claim
89 words
THE PROCESS OF PREPARING AN ORGANOPOLYSILOXANE ELASTOMER WHICH COMPRISES (1) EFFECTING REACTION BETWEEM OCTAMETHYLCYCLOTETRASILOXANE AND FROM 0.2 TO 20 PERCENT BY WEIGHT OF AN ACYL PEROXIDE TO CONVERT A PORTION OF THE OCTAMETHYLCYCLOTERTASILOXANE TO 1,2-BIS-HEPTAMETHYLCYCLOTETRASILOXANYL-ETHANE, (2) REMOVING THE DECOMPOSITION PRODUCTS OF THE AFORESAID ACYL PEROXIDE BY CONTACTING THE REACTION PRODUCTS OF (1) WITH AN ADSORBENT MATERIAL, (3) REMOVING SAID ABSORBENT MATERIAL TO YELD A MIXTURE CONSISTING ESSENTIALLY OF OCTAMETHYLCYCLOTETRASILOXANE AND 1,2-BIS-HEPTAMETHYLCYCLOTETRASILOXANYL-ETHANE, AND (4) POLYMERIZING SAID MIXTURE BY CONTACT WITH A CATALYTIC AMOUNT OF AN ORGANOPOLYSILOXANE REARRANGEMENT AND CONDENSATION CATALYST.
References Cited (Backward Citations)
US2460795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |