Patent US2550003A successfully refreshed from Google Patents.
US2550003A
Expired / Lapsed
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Copolymerization of organo-siloxanes
Assignee: Corning Glass Works
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Filing: 1949-04-15
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Granted: 1951-04-24
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Expires: 1969-04-15
Abstract
No abstract record available.
Inventors
- 👤 Daudt William Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
THE METHOD OF INTERACTING AN ORGANO-SILOXANE WHOSE STRUCTURAL UNITS CORRESPOND SUBSTANTIALLY TO THE FORMULA R2SIO WITH A SILOXANE WHOSE STRUCTURAL UNITS ARE SELECTED FROM THE GROUP CONSISTING OF MONO-ORGANOSILICONIC ACIDS WHEREIN THE ORGANIC RADICAL IS A MONOVALENT HYDROCARBON RADICAL AND SILOXANE UNITS OF THE FORMULA R''2SIO WHERE R AND R'' ARE MONOVALENT HYDROCARBON RADICALS ATTACHED TO THE SILICON THROUGH CARBONSILICON LINKAGES, THE STRUCTURAL UNITS OF SAID SILOXANE BEING LINKED THROUGH THE OXYGEN ATOMS THEREOF, SAID ORGANO-SILOXANES BEING SOLUBLE IN A COMMON SOLVENT AND AT LEAST ONE OF SAID ORGANO-SILOXANES BEING COMPLETELY DEHYDRATED, WHICH METHOD COMPRISES CONTACTING A MIXTURE OF SAID ORGANO-SILOXANES IN A HOMOGENEOUS LIQUID PHASE WITH A STRONG ACID UNDER REACTION CONDITIONS TO EFFECT INTERACTION OF SAID SILOXANES.
Claim 2
Independent Claim
119 words
THE METHOD OF INTERACTING AN ORGANO-SILOXANE WHOSE STRUCTURAL UNITS CORRESPOND SUBSTANTIALLY TO THE FORMULA R2SIO WITH A SILOXANE WHOSE STRUCTURAL UNITS ARE SELECTED FROM THE GROUP CONSISTING OF MONO-ORGANOSILICONIC ACIDS WHEREIN THE ORGANIC RADICAL IS A MONOVALENT HYDROCARBON RADICAL AND SILOXANE UNITS OF THE FORMULA R''2SIO WHERE R AND R'' ARE MONOVALENT HYDROCARBON RADICALS ATTACHED TO THE SILICON THROUGH CARBONSILICON LINKAGES, THE STRUCTURAL UNITS OF SAID SILOXANE BEING LINKED THROUGH THE OXYGEN ATOMS THEREOF, SAID ORGANO-SILOXANES BEING SOLUBLE IN A COMMON SOLVENT AND AT LEAST ONE OF SAID ORGANO-SILOXANES BEING COMPLETELY DEHYDRATED, WHICH METHOD COMPRISES CONTACTING A MIXTURE OF SAID ORGANO-SILOXANES IN A HOMOGENEOUS LIQUID PHASE WITH A STRONG ACID UNDER REACTION CONDITIONS TO EFFECT INTERACTION OF SAID SILOXANES.
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) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |