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US3960735A
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Corrosion-inhibited polyphosphate compositions
Assignee: Chemonics Industries Inc
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Filing: 1974-08-15
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Granted: 1976-06-01
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Expires: 1994-08-15
Abstract
Abstract The tendency of polyphosphate liquids to corrode aluminum is inhibited by incorporating into the liquid a minor effective amount of an iron cyanide blue, either ferric ferrocyanide or ferrous ferricyanide.
Inventors
- 👤 Kathleen P. Lacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:34
CPC Classifications
C; C09; C09K; C09K21/00; C09K21/02; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/181; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A composition consisting essentially of a. ammonium polyphosphate liquid, and b. an iron cyanide blue, said iron cyanide blue being present in a minor amount effective to substantially reduce the corrosiveness of said composition to aluminum to less than or equal to 1 mil per year as determined by the "Uniform Corrosion" test set forth in Section 4.3.4 of the "Interim Specification" 5100-00302a (June 1972), entitled "Specification for Retardant, Forest Fire, Liquid Chemical, Unthickened for Aircraft or Ground Application," issued by the United States Department of Agriculture, Forest Service.
Claim 2
Dependent Claim
89 words
A composition consisting essentially of a. ammonium polyphosphate liquid, and b. an iron cyanide blue, said iron cyanide blue being present in a minor amount effective to substantially reduce the corrosiveness of said composition to aluminum to less than or equal to 1 mil per year as determined by the "Uniform Corrosion" test set forth in Section 4.3.4 of the "Interim Specification" 5100-00302a (June 1972), entitled "Specification for Retardant, Forest Fire, Liquid Chemical, Unthickened for Aircraft or Ground Application," issued by the United States Department of Agriculture, Forest Service.
Claim 3
Dependent Claim
14 words
The composition of claim 1 in which said iron cyanide blue is ferric ferrocyanide.
Claim 4
Dependent Claim
14 words
The composition of claim 1 in which said iron cyanide blue is ferrous ferricyanide.
Claim 5
Dependent Claim
37 words
A process for preparing an ammonium polyphosphate liquid having reduced tendency to corrode aluminum, comprising incorporating into said ammonium polyphosphate liquid compounds which react in situ to form a minor effective amount of an iron cyanide blue.
Claim 6
Dependent Claim
37 words
A process for preparing an ammonium polyphosphate liquid having reduced tendency to corrode aluminum, comprising incorporating into said ammonium polyphosphate liquid compounds which react in situ to form a minor effective amount of an iron cyanide blue.
Claim 7
Dependent Claim
14 words
The process of claim 4 in which said iron cyanide blue is ferric ferrocyanide.
Claim 8
Dependent Claim
14 words
The process of claim 4 in which said iron cyanide blue is ferrous ferricyanide.
Claim 9
Dependent Claim
18 words
The process of claim 4 in which said compounds are an alkali metal ferrocyanide and a ferric compound.
Claim 10
Dependent Claim
18 words
The process of claim 4 in which said compounds are an alkali metal ferricyanide and a ferrous compound.
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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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |