US3294740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerizing cyclotrisiloxanes ii
Assignee: Dow Silicones Corp
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Filing: 1965-01-25
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Granted: 1966-12-27
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Expires: 1985-01-25
Abstract
No abstract record available.
Inventors
- 👤 Donald E Mcvannel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/04; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A METHOD COMPRISING HEATING, UNDER TEMPERATURE CONDITIONS WHICH DO NOT CAUSE DECOMPOSITION OF THE ORGANIC CATALYST, (1) A CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) CYCLOTRISILOXANES OF THE UNIT FORMULA R2SIO WHEN EACH R IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, MONOVALENT HALOHYDROCARBON RADICALS AND CYANOALKYL RADICALS, AND (B) CYCLIC SIETHYLENESILOXANES OF THE STRUCTURE
Claim 2
Independent Claim
59 words
A METHOD COMPRISING HEATING, UNDER TEMPERATURE CONDITIONS WHICH DO NOT CAUSE DECOMPOSITION OF THE ORGANIC CATALYST, (1) A CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) CYCLOTRISILOXANES OF THE UNIT FORMULA R2SIO WHEN EACH R IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, MONOVALENT HALOHYDROCARBON RADICALS AND CYANOALKYL RADICALS, AND (B) CYCLIC SIETHYLENESILOXANES OF THE STRUCTURE
Claim 3
Independent Claim
59 words
A METHOD COMPRISING HEATING, UNDER TEMPERATURE CONDITIONS WHICH DO NOT CAUSE DECOMPOSITION OF THE ORGANIC CATALYSTS, (1) A CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) CYCLOTRISILOXANES OF THE UNIT FORMULA R2SIO WHEREIN EACH R IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, MONOVALENT HALOHYDROCARBON RADICALS AND CYANOALKYL RADICALS, AND (B) CYCLIC SILETHYLENESILOXANES OF THE STRUCTURE
Claim 4
Independent Claim
59 words
A METHOD COMPRISING HEATING, UNDER TEMPERATURE CONDITIONS WHICH DO NOT CAUSE DECOMPOSITION OF THE ORGANIC CATALYSTS, (1) A CYCLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) CYCLOTRISILOXANES OF THE UNIT FORMULA R2SIO WHEREIN EACH R IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, MONOVALENT HALOHYDROCARBON RADICALS AND CYANOALKYL RADICALS, AND (B) CYCLIC SILETHYLENESILOXANES OF THE STRUCTURE
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |