US1374806A

US1374806A - Method of wood protection

Info

Publication number: US1374806A
Application number: US419063A
Authority: US
Inventors: Bartsch Paul
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-10-23
Filing date: 1920-10-23
Publication date: 1921-04-12
Anticipated expiration: 1938-04-12

Description

UNITED STATES PAUL nausea, 0] WASHINGTON, DISTRICT OI OOLUIBIA- METHOD OF WOOD PROTECTION.

He Drawing.

To all whom'itma concern:

Be it known til lat I, PAUL BAR'I'SOH, a citizen of the United States, residing at Washington, in the District of Columbia have invented a new and useful Method oi Wood Protection, of which the following is a s ecification.

his invention relates to a method of treating wood whereby it is protected against shipworms, borers, dry rot and fungus decay.

T for protecting wood subject to the action of water against shipworms, borers, dry rot and fungus decay have been ineflicient. Where creosote is used as a protective medium it will leach out in a varying length of time, depending upon the temperature of the water, leaving the wood exposed to the ravages of the destructive organisms sooner ,or later. Poisons supplied to the fibers of the wood by existing methods will not penetrate far enough to insure complete protection and after the thin outer shell of the wood has been removed, the rest can easily be destroyed by the invading organisms.

One of the objects of the present invention is to com letely poison all the tissues of the wood, the steps of the process bein such as to cause the poisons to permeate a the cells, fibers, vessels, ducts and ores, as well as the intercellular spaces in t e wood, thereby rendering the wood immune against the attack of destructive organisms.

Another object is to seal up all the poisons with which the tissues have been impre nated, thereby reventin them from leac ing out when the treate wood is sub ected to rain or submerged in fresh or saltwater.

Another object is to so treat the wood that ever newl cut surface will expose a poison w ich will promptly kill borers 1n gesting bits of the wood, with the result that shi worms and other destructive animals wil not have a chance to burrow into the wood because the microscopic larval form or adult. will be killed long before it will have buried itself within the tissues of the wood. r

.A further object is to so treat the wood as to completely extract the water and resin from the cells, fibers, vessels, ducts and pores, as well as the intercellular spaces in the wood and replace them by the poisons and the sealing medium.

Specification of Letters Patent.

Application filed October 28, 1920. Serial No. 419,068.

e various methods employed heretofore.

Patented Apr. 12, 1921.

With the foregoing and other objects in view, which will appear asethe description proceeds the invention consists in first completely eresinizin the wood with a resin solvent such as xy 01 or turpentine or an other chemical used for such pur oses until complete deresinization has ta en place. This step of the method leaves the wood in a com letely deresinized condition with the cells, hers, vessels, ducts and pores, as well as the intercellular spaces in the wood, saturated with the resin solvent. This solvent is then replaced by alcohol, or any other water miscible solution that can be employed for such purpose. The wood is next immersed in water in which the above solvent is removed. (Where non-resinous woods are treated the deresinizing process may be eliminated and the wood may be subj ected at once to the poisoning process which follows. The eresinized wood is next subjecte to saturated solutions of arsenic and copper compounds which will, conse uently, fil the cells, fibers, vessels, ducts and pores, as well as the interoellular spaces in the wood. The wood is next saturated with a precipitant, such as alcohol, which will recipitate the poisons within the tissues 0 the wood. This precipitation step is also a part of the next feature of our treatment, that is, complete dehydration, which is essential to secure complete penetration of the paraflin. The next step consists in replacing the li uid in the wood with a parafiin solvent sue as turpentine. Finally the wood is immersed in garaifin heated to above the melting point an which has been oisoned with arsenic and co or salts. T e turpentine in the wood W1 lbe displaced by the 'parailin which in turn, will completely im re ate the woo and seal the poisons, t ere y rotecting them from the action of water and preventin leaching,

1; will be apparent, from the foregoin that the wood treated in the manner set fort will contain encapsuled poison in eve cell, fiber,vess el, duct and pore, as well as in the intercellular spaces in the wood, throughout the thickness of the. wood. The poisoned parafiin', while toxic itself, will seal umll the poisons with which the tissues have n impregnated. The arsenic compounds will ison the animal praying upon the wood; in the case of dry rot or ungus, the copper salts will have an equally toxic efl'ect upon those organisms, should they attempt to penetrate the treated wood.

The success of the method is due primarily to the complete extraction of water and resin from the cells, fibers vessels, ducts and pores, as well as from the intercellulaf spaces in the wood, by chemical means and replacing these by poisons and poisoned paraflin. This can only be accomplished after complete dehydrat on and deresinization have been efl'ected, because mixing" araflin and water is a physical impossiility,'the least trace of water preventing the ingress of paraflin. It is believed that no other process of wood preservation has taken this into account. i

What is claimed iss- 1. The hereindescribed method of protectin wood which consists in the complete de ydration of the wood and subsequent saturation of the wood with ison encapsuled or sealed within the wood y 'a' substanceinin chemical dehydration of the wood, and

substitution of poisoned paraflin for the moisture displaced from the cel1's,'fibers,

. ing the wood and precipitatin the within the tissues of the woo disp acin with the araifin. 3

pores, ducts, vessels and intercellular spaces 1n the wood. A

4. The hereindescribed method of protecting wood from organisms, which consists in deresinizin the; wood with a resin solvent removing t e solvent, subjecting the wood to a saturated, solution of poison, dehydratolson the dehydrant by a paraflin solvent, an immersing the wood in melted oisoned parafiin, to completely impregnate t e wood 5. The ereindescribed method of protecting wood from destructive or anisms, whichconsists in complete dehy ration of the wood, saturation thereofb a arailin solvent, and displacement of t e so vent in the wood by melted poisoned paraflin.

6. The 'hereindescribed method of protecting wood from destructive organisms, which consists inderesinizing the wood by means of a solvent removing the solvent and resin, replacing t is with a chemical that will notonly replace the resin solvent but will,

in turn, "be re' laced by an aqueous solution of arsenic an copiper, then chemically dehydrating the Wed to cause precipitation of the poisons than replacing the dehydrant g a paraflin solvent and wall replacing t e parafiin solvent is poisone parafiin;

In testimon that claim the foregoing as my own, I ave hereto aflixed my signature in the prescnceof two witnesses. I

' PAUL BARTEKJ'H.v

Witnesses! r Hammer D. Lawson, Iva E. Sun-sou.