US2542334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation of siloxanes
Assignee: Corning Glass Works
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Filing: 1946-04-24
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Granted: 1951-02-20
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Expires: 1966-04-24
Abstract
No abstract record available.
Inventors
- 👤 Hyde James Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:20
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
THE METHOD OF PREPARING ORGANOSILOXANE POLYMERS WHICH COMPRISES CONTACTING A SOLVENTFREE ORGANOPOLYSILOXANE IN WHICH ALL OF THE ORGANIC RADICALS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL AND MONOCYCLIC ARYL RADICALS, IN WHICH SILOXANE THERE ARE BETWEEN 1.3 AND 2.01 ORGANIC RADICALS PER SILICON ATOM, OF WHICH ORGANIC RADICALS AT LEAST SOME ARE ALKYL RADICALS, WHICH POLYSILOXANE HAS ON THE AVERAGE A MOLECULE AGGREGATION OF LESS THAN 20 SILOXANE UNITS PER MOLECULE, AND IN WHICH POLYSILOXANE THE REMAINING VALENCES OF THE SILICON ATOMS ARE SATISFIED BY HYDROXYL RADICALS, WITH AN ALKALI METAL HYDROXIDE IN AMOUNT FROM ONE ATOM OF ALKALI METAL PER 10,000 ATOMS OF SILICON TO ONE ATOM OF ALKALI METAL PER 25 ATOMS OF SILICON UNTIL AN INCREASE IN THE VISCOSITY OF THE POLYSILOXANE IS OBTAINED, SAID POLYSILOXANE AND ALKALI METAL HYDROXIDE BEING MAINTAINED DURING CONTACT AT A TEMPERATURE LESS THAN THAT AT WHICH DESTRUCTIVE DISTILLATION WOULD OCCUR.
Claim 2
Independent Claim
150 words
THE METHOD OF PREPARING ORGANOSILOXANE POLYMERS WHICH COMPRISES CONTACTING A SOLVENTFREE ORGANOPOLYSILOXANE IN WHICH ALL OF THE ORGANIC RADICALS ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL AND MONOCYCLIC ARYL RADICALS, IN WHICH SILOXANE THERE ARE BETWEEN 1.3 AND 2.01 ORGANIC RADICALS PER SILICON ATOM, OF WHICH ORGANIC RADICALS AT LEAST SOME ARE ALKYL RADICALS, WHICH POLYSILOXANE HAS ON THE AVERAGE A MOLECULE AGGREGATION OF LESS THAN 20 SILOXANE UNITS PER MOLECULE, AND IN WHICH POLYSILOXANE THE REMAINING VALENCES OF THE SILICON ATOMS ARE SATISFIED BY HYDROXYL RADICALS, WITH AN ALKALI METAL HYDROXIDE IN AMOUNT FROM ONE ATOM OF ALKALI METAL PER 10,000 ATOMS OF SILICON TO ONE ATOM OF ALKALI METAL PER 25 ATOMS OF SILICON UNTIL AN INCREASE IN THE VISCOSITY OF THE POLYSILOXANE IS OBTAINED, SAID POLYSILOXANE AND ALKALI METAL HYDROXIDE BEING MAINTAINED DURING CONTACT AT A TEMPERATURE LESS THAN THAT AT WHICH DESTRUCTIVE DISTILLATION WOULD OCCUR.
References Cited (Backward Citations)
US2371068A
Cited
US2482276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |