US2640031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolysis resistant heat transfer composition
Assignee: John B. Pierce Laboratory
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Filing: 1950-02-09
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Granted: 1953-05-26
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Expires: 1970-02-09
Abstract
No abstract record available.
Inventors
- 👤 Fano Ettore Da
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:50
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A HEAT TRANSFER MEDIUM WHICH IS RESISTANT TO HYDROLYSIS BY WATER, AND WHICH HAS A FREEZING POINT BELOW ABOUT -62* F., A BOILING POINT ABOVE ABOUT 372* F., A VISCOSITY AT -31* F., BELOW ABOUT 16.5 CENTISTOKES, AND A VISCOSITY AT 77* F. WITHIN THE RANGE OF ABOUT 1.8 TO ABOUT 2.7 CENTISTOKES, CONSISTING ESSENTIALLY OF A MIXTURE OF TETRA-ISOPROPYL ORTHOSILICATE, TRI-ISOPROPYL MONO-ISOBUTYL ORTHOSILICATE, DI-ISOPROPYL TRI-ISOBUTYL ORTHOSILICATE, MONO-ISOPROPYL TRI-ISOBUTYL ORTHOSILICATE AND TETRA-ISOBUTYL ORTHOSILICATE, THE ISOPROPYL AND ISOBUTYL RADICALS IN ALL OF THE COMPOUNDS OF THE SAID MIXTURE BEING IN THE PROPORTION OF FROM 1 TO 3 ISOPROPYL RADICALS TO FROM 3 TO 1 ISOBUTYL RADICALS.
Claim 2
Dependent Claim
105 words
A HEAT TRANSFER MEDIUM WHICH IS RESISTANT TO HYDROLYSIS BY WATER, AND WHICH HAS A FREEZING POINT BELOW ABOUT -62* F., A BOILING POINT ABOVE ABOUT 372* F., A VISCOSITY AT -31* F., BELOW ABOUT 16.5 CENTISTOKES, AND A VISCOSITY AT 77* F. WITHIN THE RANGE OF ABOUT 1.8 TO ABOUT 2.7 CENTISTOKES, CONSISTING ESSENTIALLY OF A MIXTURE OF TETRA-ISOPROPYL ORTHOSILICATE, TRI-ISOPROPYL MONO-ISOBUTYL ORTHOSILICATE, DI-ISOPROPYL TRI-ISOBUTYL ORTHOSILICATE, MONO-ISOPROPYL TRI-ISOBUTYL ORTHOSILICATE AND TETRA-ISOBUTYL ORTHOSILICATE, THE ISOPROPYL AND ISOBUTYL RADICALS IN ALL OF THE COMPOUNDS OF THE SAID MIXTURE BEING IN THE PROPORTION OF FROM 1 TO 3 ISOPROPYL RADICALS TO FROM 3 TO 1 ISOBUTYL RADICALS.
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) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |