US2673843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefaction of silicone rubber gum and products thereof
Assignee: Connecticut Hard Rubber Co
•
Filing: 1951-05-17
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Granted: 1954-03-30
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Expires: 1971-05-17
Abstract
No abstract record available.
Inventors
- 👤 Bingham J Humphrey
- 👤 Harry H Wasserman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:06
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD WHICH INCLUDES THE STEP OF PARTIALLY DEPOLYMERIZING A SOLID POLYDIMETHYLSILOXANE ELASTOMER TO FROM A VISCOUS LIQUID, FILTERING THE MATERIAL WHILE IN THE LIQUID STATE TO REMOVE NON-SILICONE SOLIDS PRESENT IN THE ELASTOMER, AND REPOLYMERIZING THE MATERIAL TO FROM A MODIFIED SOLID POLYDIMETHYLSILOXANE, SAID DEPOLYMERIZATION BEING ACCOMPLISHED BY SUBJECTING THE SOLID ELASTOMER AT APPROXIMATELY ROOM TEMPERATURE TO AN ESSENTIALLY ANHYDROUS ACID CHOSEN FROM THE CLASS CONSISTING OF HYDROCHLORIC ACID, HYDROBROMIC ACID, HYDRIODIC ACID, THIONYL CHLORIDE, ACETYL CHLORIDE, BENZOYL CHLORIDE AND PHTHALYL CHLORIDE.
Claim 2
Independent Claim
83 words
THE METHOD WHICH INCLUDES THE STEP OF PARTIALLY DEPOLYMERIZING A SOLID POLYDIMETHYLSILOXANE ELASTOMER TO FROM A VISCOUS LIQUID, FILTERING THE MATERIAL WHILE IN THE LIQUID STATE TO REMOVE NON-SILICONE SOLIDS PRESENT IN THE ELASTOMER, AND REPOLYMERIZING THE MATERIAL TO FROM A MODIFIED SOLID POLYDIMETHYLSILOXANE, SAID DEPOLYMERIZATION BEING ACCOMPLISHED BY SUBJECTING THE SOLID ELASTOMER AT APPROXIMATELY ROOM TEMPERATURE TO AN ESSENTIALLY ANHYDROUS ACID CHOSEN FROM THE CLASS CONSISTING OF HYDROCHLORIC ACID, HYDROBROMIC ACID, HYDRIODIC ACID, THIONYL CHLORIDE, ACETYL CHLORIDE, BENZOYL CHLORIDE AND PHTHALYL CHLORIDE.
References Cited (Backward Citations)
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Cited
US2550003A
Cited
US2392713A
Cited
US2460795A
Cited
US2430032A
Cited
US2575912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |