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US Patent: 142,347
Preserving and Drying Lumber
John Oliver - Toronto, ON Canada

USPTO Classifications:
34/415, 427/254

Tool Categories:


Not known to have been produced

Robert Thomas
William Gill

Patent Dates:
Applied: May 21, 1873
Granted: Sep. 02, 1873

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This invention has for its object the preservation, of lumber used in the construction of ships, steamboats, railroad-cars, buildings, and structures generally, and also for other purposes where durability is an especial object. It has also for its object the most expeditious and effective system of drying the lumber. In the preservation of lumber various processes have been used some of them in immersing the lumber in a tank containing an antiseptic solution others by sprinkling powders of corrosive sublimate, arsenic, and common salt on the green lumber, piling and leaving it until fermentation takes place. The sap is not expelled from the lumber by this process, but becomes solidified by the fermentation caused by the aforesaid powders. The first part of my invention consists in subjecting the lumber to a moderate pressure of steam impregnated with sulphate of zinc and alum—substances which I am not aware of ever having been used for this purpose— the astringent and antiseptic properties of which are well known. I allow two and a half pounds in weight of each substance to one thousand feet of one-inch pine lumber. The pressure of steam that I use is from thirty to forty pounds to the square inch, instead of high-pressure steam from sixty to one hundred pounds, which has been used in steaming purposes. I allow the action of this lower pressure and impregnated steam to continue for the space of fifteen minutes, or thereabout, for pine boards one inch thick; for boards of a greater thickness, for pine blocks, or for hard wood, a proportionately longer time is necessary. The second part of my invention relates to the drying of the lumber, and this immediately after it has been treated for preservation. In other processes for drying lumber it is, after having been steamed under a pressure of from sixty to one hundred pounds to the square inch, exposed in the open air for thirty days, less or more. In frosty weather, from the moisture in the lumber freezing, the process during the winter mouths is impracticable. By my process I complete the drying of the lumber in the same tank which is used for the preserving process, and so closely upon the termination of that process as to become almost a part of the same operation. My invention, which includes both processes, can be carried on throughout the whole year.

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