Patent US4460478A successfully refreshed from Google Patents.
US4460478A
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Orthosilicate ester containing heat transfer fluids
Assignee: Prestone Products Corp USA
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Filing: 1982-09-30
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Granted: 1984-07-17
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Expires: 2002-09-30
Abstract
Abstract A novel composition concentrate comprising at least one glycol together with at least one orthosilicate ester having improved stability at a pH of between about 6.0 and about 8.0.
Inventors
- 👤 Paul H. Mohr
- 👤 Eugene A. Zientek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:46
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A corrosion-inhibitive heat transfer composition concentrate comprising at least one glycol and at least one orthosilicate ester, said concentrate having a pH of between about 6.0 and about 8.0, and said concentrate containing an amount of orthosilicate ester sufficient to provide at least about 25 ppm and not greater than 4000 ppm of silicon in the concentrate.
Claim 2
Dependent Claim
57 words
A corrosion-inhibitive heat transfer composition concentrate comprising at least one glycol and at least one orthosilicate ester, said concentrate having a pH of between about 6.0 and about 8.0, and said concentrate containing an amount of orthosilicate ester sufficient to provide at least about 25 ppm and not greater than 4000 ppm of silicon in the concentrate.
Claim 3
Dependent Claim
19 words
The composition concentrate of claim 1 which additionally contains a corrosion-inhibitive effective amount of at least one inorganic silicate.
Claim 4
Dependent Claim
22 words
The composition concentrate of claim 2 which consists essentially of glycol, at least one orthosilicate ester and at least one inorganic silicate.
Claim 5
Dependent Claim
17 words
The composition concentrate of claim 1 which consists essentially of glycol and at least one orthosilicate ester.
Claim 6
Dependent Claim
30 words
The composition concentrate of claim 1 wherein said orthosilicate ester is present in an amount sufficient to provide from about 100 to about 800 ppm of silicon in said concentrate.
Claim 7
Dependent Claim
21 words
The composition concentrate of any of claims 1 through 5 wherein said orthosilicate ester is tetramethylorthosilicate or tetraethylorthosilicate, or mixtures thereof.
Claim 8
Dependent Claim
40 words
The composition concentrate of any of claims 1 through 5 which additionally contains an alkali metal or alkanolamine salt of borate, or mixtures thereof, in an amount of less than 50 wt. % based on the weight of the concentrate.
Claim 9
Dependent Claim
36 words
The composition concentrate of any of claims 1 through 5 which additionally contains at least one amine or alkanolamine phosphate, in an amount of less than 50 wt. % based on the weight of the concentrate.
Claim 10
Dependent Claim
35 words
The composition concentrate of any of claims 1 through 5 which additionally contains a borate/phosphate mixture selected from the group consisting of alkali metal, amine, or alkanolamine salts of borate or phosphate or mixtures thereof.
Claim 11
Dependent Claim
33 words
The composition concentrate of any of claims 1 through 5 which additionally contains at least one alkali metal, amine or alkanolamine salt of benzoate, hydroxy benzoate, dicarboxylate, or acids thereof, or mixtures thereof.
Claim 12
Dependent Claim
19 words
The composition concentrate of any of claims 1 through 5 wherein said pH is between about 6.0 and 6.6.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |