THE LAW OF PATENTS FOR USEFUL INVENTIONS. BY WILLIAM C. ROBINSON, LL.D., PROFESSOR OF LAW IN YALE UNIVERSITY. IN THREE VOLUMES. VOL. II. Felix qui potuit rerum cognoscere cansas. —VIRG. Georg. . 490.- BOSTON: LITTLE, BROWN, AND COMPANY. {37220 APR 26 1951 Copyright, 1890, BY WILLIAM C. ROBINSON. UNIVERSITY PRESS: TABLE OF CONTENTS. 416. Patent Office Established to Secure the Issue of Legal and Correct Authority of Patent Office to Amend Defective Letters-Patent 418. Illegal Letters-Patent Repealed not by Patent Office but by Courts § 422. Grant of Letters-Patent Governed by Statute and by Rules of Patent Office: Authority of such Rules 423. Grant of Letters-Patent Illegal unless Statutory Prerequisites 424. Authority of the Commissioner, Acting Commissioner, and Ex- |