US2834754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing volatile organopolysiloxanes from high molecular weight organopolysiloxanes by stripping gas and kneading
Assignee: General Electric Co
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Filing: 1953-12-03
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Granted: 1958-05-13
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Expires: 1973-12-03
Abstract
No abstract record available.
Inventors
- 👤 Robert L Hatch
- 👤 John F Blumenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:10
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE PROCESS WHICH COMPRISES SUBJECTING AN ORGANOPOLYSILOXANE OF AT LEAST 500,000 CENTIPOISE VISCOSITY TO A KNEADING ACTION AT A TEMPERATURE FROM 75* TO 175*C. WHILE SIMULTANEOUSLY AND CONTINUOUSLY INTRODUCING A STRIPPING GAS SELECTED FROM THE CLASS CONSISTING OF AIR, STEAM, NITROGEN, NEON, AND ARGON THROUGH THE AFORESAID ORGANOPOLYSILOXANE BY MEANS OF THE KNEADING ACTION, AND SIMULTANEOLUSLY AND CONTINUOUSLY SWEEPING OUT BY MEANS OF THE EFFLUENT STRIPPING GAS, THE VOLATILE MATERIALS ORIGINALLY PRESENT IN THE AFORESAID ORGANOPOLYSILOXANE, THE ORGANIC GROUPS OF THE ORGANOPOLYSILOXANE BEING MONOVALENT ORGANIC RADICALS SELECTED FROM THE CLASS CONSISTING OF MONOVALENT HYDROCARBON RADICALS AND CHLORINATED ARYL RADICALS, THERE BEING PRESENT FROM ABOUT 1.98 TO 2.05 ORGANIC GROUPS PER SILICON ATOM.
Claim 2
Dependent Claim
112 words
THE PROCESS WHICH COMPRISES SUBJECTING AN ORGANOPOLYSILOXANE OF AT LEAST 500,000 CENTIPOISE VISCOSITY TO A KNEADING ACTION AT A TEMPERATURE FROM 75* TO 175*C. WHILE SIMULTANEOUSLY AND CONTINUOUSLY INTRODUCING A STRIPPING GAS SELECTED FROM THE CLASS CONSISTING OF AIR, STEAM, NITROGEN, NEON, AND ARGON THROUGH THE AFORESAID ORGANOPOLYSILOXANE BY MEANS OF THE KNEADING ACTION, AND SIMULTANEOLUSLY AND CONTINUOUSLY SWEEPING OUT BY MEANS OF THE EFFLUENT STRIPPING GAS, THE VOLATILE MATERIALS ORIGINALLY PRESENT IN THE AFORESAID ORGANOPOLYSILOXANE, THE ORGANIC GROUPS OF THE ORGANOPOLYSILOXANE BEING MONOVALENT ORGANIC RADICALS SELECTED FROM THE CLASS CONSISTING OF MONOVALENT HYDROCARBON RADICALS AND CHLORINATED ARYL RADICALS, THERE BEING PRESENT FROM ABOUT 1.98 TO 2.05 ORGANIC GROUPS PER SILICON ATOM.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |