US2634252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerizing organosiloxanes with alkoxides and alcohol-hydroxide complexes
Assignee: Dow Silicones Corp
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Filing: 1949-05-25
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Granted: 1953-04-07
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Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Warrick Earl Leathen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:41
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
THE METHOD OF POLYMERIZING A COMPLETELY CONDENSED LIQUID DIORGANOPOLYSILOXANE IN WHICH THE ORGANIC RADICALS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL AND MONOCYCLIC ARYL RADICALS, WHICH COMPRISES MAINTAINING THE SILOXANE IN INTIMATE CONTACT WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF ROM AND (ROH)X.MOH, WHERE R IS AN ALKYL RADICAL OF LESS THAN SIX CARBON ATOMS, X HAS A VALUE FROM 0.5 TO 2.5 AND M IS AN ALKALI METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM, SAID CATALYST BEING PRESENT IN AMOUNT FROM ONE ALKALI METAL ATOM PER 100 SILICON ATOMS TO ONE ALKALI METAL ATOM PER 25,000 SILICON ATOMS UNTIL A BENZENE SOLUBLE SOLID POLYMER HAVING A PENETROMETER READING OF LESS THAN 380 AFTER TEN SECONDS AT 25* C. ACCORDING TO ASTM-D217-44T. IS OBTAINED.
Claim 2
Independent Claim
130 words
THE METHOD OF POLYMERIZING A COMPLETELY CONDENSED LIQUID DIORGANOPOLYSILOXANE IN WHICH THE ORGANIC RADICALS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL AND MONOCYCLIC ARYL RADICALS, WHICH COMPRISES MAINTAINING THE SILOXANE IN INTIMATE CONTACT WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF ROM AND (ROH)X.MOH, WHERE R IS AN ALKYL RADICAL OF LESS THAN SIX CARBON ATOMS, X HAS A VALUE FROM 0.5 TO 2.5 AND M IS AN ALKALI METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM, SAID CATALYST BEING PRESENT IN AMOUNT FROM ONE ALKALI METAL ATOM PER 100 SILICON ATOMS TO ONE ALKALI METAL ATOM PER 25,000 SILICON ATOMS UNTIL A BENZENE SOLUBLE SOLID POLYMER HAVING A PENETROMETER READING OF LESS THAN 380 AFTER TEN SECONDS AT 25* C. ACCORDING TO ASTM-D217-44T. 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) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |