Patent US4247329A successfully refreshed from Google Patents.
US4247329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water repellent aqueous wood concentrates
Assignee: Hickson Corp
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Filing: 1980-03-27
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Granted: 1981-01-27
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Expires: 2000-03-27
Abstract
Abstract Stable chromated copper arsenate Type B wood preserving concentrates comprising a chromium additive, a copper additive and an arsenic additive with a total of from 5 to 45% oxides and sulfamic acid wherein said copper additive is present in an amount greater than will react with said chromium additive and said sulfamic acid is present in an amount that will inhibit the reaction of the excess copper additive with said arsenic additive.
Inventors
- 👤 George B. Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:11
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; B; B27; B27K; B27K3/00; B27K3/16; B27K3/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
An aqueous cellulosic concentrate comprising in an acid medium a chromium additive, a copper additive and an arsenic additive wherein the active ingredient is CrO 3 , CuO and As 2 O 5 respectively with a total from 5 to 45% of oxides, and sulfamic acid wherein said copper additive is present in an amount greater than will react with said chromium additive and said sulfamic acid is present in an amount that will inhibit the reaction of the excess copper additive with said arsenic additive.
Claim 2
Dependent Claim
86 words
An aqueous cellulosic concentrate comprising in an acid medium a chromium additive, a copper additive and an arsenic additive wherein the active ingredient is CrO 3 , CuO and As 2 O 5 respectively with a total from 5 to 45% of oxides, and sulfamic acid wherein said copper additive is present in an amount greater than will react with said chromium additive and said sulfamic acid is present in an amount that will inhibit the reaction of the excess copper additive with said arsenic additive.
Claim 3
Dependent Claim
21 words
The concentrate of claim 1 wherein the chromium additive and sulfamic acid combined are substantially stoichiometrically equivalent to the copper additive.
Claim 4
Dependent Claim
44 words
The concentrate of claim 1 containing from 33 to 38% hexavalent chromium as CrO 3 , from 18 to 22% copper as CuO, from 42 to 48% arsenic as As 2 O 5 , and from about 4% to about 6% of sulfamic acid.
Claim 5
Dependent Claim
13 words
The concentrate of claim 1 wherein the copper additive is basic cupric carbonate.
Claim 6
Dependent Claim
12 words
The concentrate of claim 1 wherein the arsenic additive is arsenic acid.
Claim 7
Dependent Claim
13 words
The concentrate of claim 1 wherein the chromium additive is CrO 3 .
Claim 8
Dependent Claim
75 words
In a method for forming a stable aqueous cellulosic-treating concentrate comprising a chromium additive, a copper additive, and an arsenic additive with a total of from 5 to 45% oxides and wherein said copper additive is present in an amount greater than will react with said chromium additive, the improvement comprising adding sufficient sulfamic acid to react with the excess copper additive so as to inhibit reaction between the arsenic additive and the copper additive.
Claim 9
Dependent Claim
75 words
In a method for forming a stable aqueous cellulosic-treating concentrate comprising a chromium additive, a copper additive, and an arsenic additive with a total of from 5 to 45% oxides and wherein said copper additive is present in an amount greater than will react with said chromium additive, the improvement comprising adding sufficient sulfamic acid to react with the excess copper additive so as to inhibit reaction between the arsenic additive and the copper additive.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |