Wood treatment with ammoniacal liquor and carbon dioxide
Patent 4008342 Issued on February 15, 1977. Estimated Expiration Date: 
February 15, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 15, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 675826 1680529 InventorAssigneeApplicationNo. 573557 filed on 05/01/1975US Classes:427/297, Wood base422/33, With positive pressure or vacuum427/333, Plural film forming coatings wherein one coating contains a chemical treating agent for the other427/343Inorganic coatingExaminersPrimary: Lusignan, Michael R.Attorney, Agent or FirmAbstractA method of preventing the deposition of preservative solids onto the surface of the material being treated from an ammoniacal treating liquor of the type wherein deposition of the treating chemical within the wood requires evaporation of the ammonia from the solution. After the impregnation treatment the wood is contacted with an atmosphere containing carbon dioxide in an amount and for a time sufficient for the carbon dioxide to combine with a significant amount of the ammonium hydroxide in the treating liquor on the wood to form ammonium carbonate and/or bicarbonate and thereby inhibit the loss of ammonia from the liquor for a time sufficient for the liquor on the wood to migrate into the wood. | |
