US4323477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid copper chromate concentrates
Assignee: Allied Steel and Wire Ltd
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Filing: 1979-10-03
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Granted: 1982-04-06
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Expires: 1999-10-03
Abstract
Abstract An aqueous copper chromate concentrate substantially free of sulfate anions is provided which can be diluted for use as a wood preservative. The concentrate is formed of a hexavalent chromium compound, a bivalent copper compound, and an acid selected from nitric, sulfamic, fluosilicic, fluoboric and mixtures wherein the total oxide content of CuO and CrO3 is from 25 to 60%.
Inventors
- 👤 Robert E. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:41
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/16; B27K3/32; A; A01; A01N; A01N59/00; A01N59/16; A01N59/20; B27K3/20; B27K3/22; B27K3/26; B27K3/30; B27K3/34; B27K3/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
An aqueous copper chromate concentrate substantially free of sulfate anions formed of a hexavalent chromium compound selected from sodium dichromate, potassium dichromate, chromium trioxide and mixtures, a bivalent copper compound selected from basic cupric carbonate basic cupric hydroxide, cupric nitrate, cupric oxide and mixtures, and an acid selected from nitric, sulfamic, fluosilicic, fluoboric and mixtures wherein the total oxide content of CuO and CrO 3 is from 25 to 60% and the CuO to CrO 3 ratio is from 1 to 2.145 to 1 to 2.161.
Claim 2
Dependent Claim
86 words
An aqueous copper chromate concentrate substantially free of sulfate anions formed of a hexavalent chromium compound selected from sodium dichromate, potassium dichromate, chromium trioxide and mixtures, a bivalent copper compound selected from basic cupric carbonate basic cupric hydroxide, cupric nitrate, cupric oxide and mixtures, and an acid selected from nitric, sulfamic, fluosilicic, fluoboric and mixtures wherein the total oxide content of CuO and CrO 3 is from 25 to 60% and the CuO to CrO 3 ratio is from 1 to 2.145 to 1 to 2.161.
Claim 3
Dependent Claim
13 words
The concentrate of claim 1 wherein the hexavalent chromium compound is chromium trioxide.
Claim 4
Dependent Claim
11 words
The concentrate of claim 1 wherein the acid is sulfamic acid.
Claim 5
Dependent Claim
11 words
The concentrate of claim 1 wherein the acid is fluosilicic acid.
Claim 6
Dependent Claim
10 words
The concentrate of claim 1 wherein the acid is fluoboric.
Claim 7
Dependent Claim
10 words
The concentrate of claim 1 wherein the acid is nitric.
Claim 8
Dependent Claim
86 words
An aqueous cellulose preservative solution substantially free of sulfate anions formed of a hexavalent chromium compound selected from sodium dichromate, potassim dischromate, chromium trioxide and mixtures, a bivalent copper compound selected from basic cupric carbonate, basic cupric hydroxide, cupric nitrate, cupric oxide and mixtures, and an acid selected from nitric, sulfamic, fluosilicic, fluoboric, and mixtures wherein the total oxide content of CuO and CrO 3 is from 0.8 to 14% and the CuO to CrO 3 ratio is from 1 to 2.145 to 1 to 2.161.
Claim 9
Dependent Claim
86 words
An aqueous cellulose preservative solution substantially free of sulfate anions formed of a hexavalent chromium compound selected from sodium dichromate, potassim dischromate, chromium trioxide and mixtures, a bivalent copper compound selected from basic cupric carbonate, basic cupric hydroxide, cupric nitrate, cupric oxide and mixtures, and an acid selected from nitric, sulfamic, fluosilicic, fluoboric, and mixtures wherein the total oxide content of CuO and CrO 3 is from 0.8 to 14% and the CuO to CrO 3 ratio is from 1 to 2.145 to 1 to 2.161.
Claim 10
Dependent Claim
13 words
The solution of claim 7 wherein the hexavalent chromium compound is chromium trioxide.
Claim 11
Dependent Claim
13 words
The solution of claim 7 wherein the pH is from 2 to 3.9.
Claim 12
Dependent Claim
11 words
The solution of claim 7 wherein the acid is sulfamic acid.
Claim 13
Dependent Claim
11 words
The solution of claim 7 wherein the acid is fluosilicic acid.
Claim 14
Dependent Claim
11 words
The solution of claim 7 wherein the acid is fluoboric acid.
Claim 15
Dependent Claim
11 words
The solution of claim 7 wherein the acid is nitric acid.
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) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |