US2739952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organopolysiloxanes stabilized with organophosphorus compounds
Assignee: General Electric Co
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Filing: 1953-06-24
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Granted: 1956-03-27
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Expires: 1973-06-24
Abstract
No abstract record available.
Inventors
- 👤 Robert G Linville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5397
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
THE PROCESS FOR REMOVING LOW BOILING, VOLATILE METHYLPOLYSILOXANES FROM A HIGH MOLECULAR WEIGHT METHYLPOLYSILOXANE RESULTING FROM THE POLYMERIZATION OF A LOW MOLECULAR WEIGHT METHYLPOLYSILOXANE EMPLOYING POTASSIUM HYDROXIDE AS THE POLYMERIZING AGENT, WHICH PROCESS COMPRISES (1) DISPERSING IN THE AFORESAID HIGH MOLECULAR WEIGHT METHYLPOLYSILOXANE STABILIZING AMOUNTS OF TRIPHENYL PHOSPHITE, AND (2) THEREAFTER SUBJECTING THE MIXTURE OF INGREDIENTS TO DISTILLATION AT ELEVATED TEMPERATURE WHEREBY THE LOW BOILING VOLATILE MATERIALS ARE READILY REMOVED WITH A MINIMUM OF UNDESIRABLE DEGRADATION AND DEPOLYMERIZATION OF THE HIGHER MOLECULAR WEIGHT METHYLPOLYSILOXANE.
References Cited (Backward Citations)
US2492129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |