USRE12470E - Richard liebold - Google Patents

Description

UNITED STATES PATENT OFFICE.

RICHARD LIEBOLD, OF VVEIMAR, GERMANY.

MANUFACTURE OF ACID-PROOF AND IMPERIVIEABLE CEMENTS.

Specification of Reissued Letters Patent.

Reissued April 3, 1906.

Original No. 771,080, dated September 27, 1904. Application for reissue filed February '7, 1906. Serial No. 300,015.

To all whom it may concern Be it known that I, RICHARD LIEBOLD, merchant, a subject of the Grand Duke of Saxe- Weimar, residing at Weimar. in the Grand Duchy of SaXe Weimar, German Empire, have invented certain new and useful Improvements in the Manufacture of Acid-Proof and Impermeable Cements, of which the following is a specification.

My invention relates to improvements in the manufacture of acid proof and impermeable cements.

To add to ground Portland cement soda,

\ potash, or gypsum for the purpose of accelerating or retarding, as the case may be, the process ofbinding the cement and to cause it to retain for a longer time the waternecessary for the hardening of the cement is equally as well known as the impregnatin of cement blocks with paraffin, wax, col ophony, or stearin to make them impermeable and to prevent the sweating of the stone. The commonly-used unimpregnated 'cements have generally a tendency to destroy the color of stones manufactured from such cements. To avoidthis and at the same time to manufacture a cement which for any len th of time is acid-proof and impermeable, is the purpose of my invention. To this end I roc ed as follows: To every one hundred ki ograms of ready-burnt but not ground cement I add a mixture of three hundred grams. of Japan vegetable or berry wax and twenty grams of caustic potash dissolved in eight liters of boiling water and thoroughly mix the same. After the so-mixed cement is cooled down the same is dried and finely ground. After the cement has passedv through the various Well-known manipulations it isready for use. Many trials have demonstrated that cement so prepared is perfectly impermeable and acid-proof and is therefore specially adapted to be used for all building purposes and for the manufacture of cement blocks. Colored cement blocks so prepared do not lose their color.

Having now particularly described the nature of my invention, What I claim is 1. A process of making acid-proof and impermeable cements, which consists in adding to ready-burnt but not ground cement amixture of wax and caustic potash dissolved in boiling water, and then grinding the same.

2. A process for makin acid-proof and im permeable cements, whic consists in adding to every one hundred kilograms of readyburnt but not ground cement a mixture ,of three hundred grams of Japan vegetable or berry wax, and twenty grams of caustic potash dissolved in eight liters of boiling water, and then grinding the same.

In testimony whereof I have hereunto set my hand in psesence of two'subscribing wit-.

nesses.

RICHARD LIEBOLD.

Witnesses:

WOLDEMAR HAI'JPT, HENRY HAs'PER.