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Excerpt from Abridgment of United States, British and German Patents on Alloys: Covering the Production of Platinum Substitutes, Including Alloys Having Certain of the Properties of Platinum All United States patents more than seventeen years old, and all foreign patents Which were not duplicated in this country are open to free public use. We have also in cluded the characteristic claims of existing important United States patents so as to give an approximate idea of their scope. Every effort has been made to include all pertinent mat ter and it is believed that a mine of valuable information is herein offered to the technical world. Whenever an assignment of a United States Patent, still in force, appears on the face thereof, we have included this information. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.