US4218249A
Expired / Lapsed
US
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Water-repellent aqueous wood-treating solutions
Assignee: Beazer East Inc
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Filing: 1979-07-09
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Granted: 1980-08-19
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Expires: 1999-07-09
Abstract
Abstract Aqueous wood- and paper-treating solutions are provided of hexavalent chromium and, optionally, copper or copper-arsenic mixtures with aluminum halohydrates in an acid medium which provide increased water repellency.
Inventors
- 👤 Robert E. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:58
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/12; D21H21/00; D21H21/14; D21H21/16; B; B27; B27K; B27K3/00; B27K3/16; B27K3/22; B27K3/26; B27K3/28; B27K3/32; B27K3/52
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
32 words
An aqueous solution for providing increased water repellency to cellulose comprising an aqueous acid medium having disolved therein an aluminum halohydrate and oxides of hexavalent chromium and, optionally, copper and copper-arsenic mixtures.
Claim 2
Dependent Claim
32 words
An aqueous solution for providing increased water repellency to cellulose comprising an aqueous acid medium having disolved therein an aluminum halohydrate and oxides of hexavalent chromium and, optionally, copper and copper-arsenic mixtures.
Claim 3
Dependent Claim
26 words
The solution of claim 1 wherein the oxides are present in an amount from between about 0.5 and about 45 percent by weight of the solution.
Claim 4
Dependent Claim
24 words
The solution of claim 1 wherein the oxides are present in an amount from about 0.8 and 14 percent by weight of the solution.
Claim 5
Dependent Claim
12 words
The solution of claim 1 wherein the aluminum halohydrate is aluminum chlorohydrate.
Claim 6
Dependent Claim
27 words
The solution of claim 1 wherein the aluminum halohydrate is present in an amount from between about 0.5 and about 25.0 percent by weight of the solution.
Claim 7
Dependent Claim
26 words
The solution of claim 1 wherein the aluminum halohydrate is present in an amount from about 0.7 to about 6 percent by weight of the solution.
Claim 8
Dependent Claim
14 words
The solution of claim 1 wherein the pH is from about 0.1 and 5.0.
Claim 9
Dependent Claim
12 words
The solution of claim 4 containing oxides of chromium, copper and arsenic.
Claim 10
Dependent Claim
11 words
The solution of claim 4 containing oxides of chromium and copper.
Claim 11
Dependent Claim
8 words
The solution of claim 4 containing chromium oxide.
Claim 12
Independent Claim
39 words
A method for increasing the water repellency of cellulose comprising treating the cellulose with an effective amount of an aqueous acid medium having dissolved therein an aluminum halohydrate and oxides of hexavalent chromium and, optionally, copper and copper-arsenic mixtures.
Claim 13
Independent Claim
39 words
A method for increasing the water repellency of cellulose comprising treating the cellulose with an effective amount of an aqueous acid medium having dissolved therein an aluminum halohydrate and oxides of hexavalent chromium and, optionally, copper and copper-arsenic mixtures.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |