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A TREATISE

ON THE

LAW AND PRACTICE OF PATENTS

FOR INVENTIONS

WITH AN APPENDIX OF

Statutes, Rules, and foreign and Colonial Patent Laws

International Conbention and Protocol

BY

JAMES JOHNSON

OF THE MIDDLE TEMPLE, BARRISTER-AT-LAW

AND

J. HENRY JOHNSON

SOLICITOR, ASSOC. INST.C.E.

PAST PRESIDENT OF THE INSTITUTE OF PATENT AGENTS

SIXTH EDITION
REVISED AND ENLARGED

NEW YORK
LONGMANS, GREEN, AND CO.

15 EAST 1611 STREET

1890

PREFACE

TO

THE

SIXTH

EDITION

In preparing the Sixth Edition of this work for the press, considerable changes have been made both by way of enlargement and in the arrangement of the matter. The provisions of three supplementary Acts of Parliament and of four new sets of official Rules, now consolidated with the previous Rules, have been noticed, whilst numerous decisions of the Courts during the last six years, many of which have an important bearing on the Law of Patents, have been cited. Several chapters have been divided with a view to a fuller and more convenient treatment of the subjects, and additional chapters on other branches of the law have been introduced. Every page has undergone careful revision, and no pains have been spared to render the treatise one that patentees and inventors may consult with confidence as a trustworthy exposition of that branch of law with which their interests are most closely concerned. It may be added, that although the treatise was originally written especially for their use, the authors venture to think that in its enlarged form it may deserve the notice of the legal profession, since the large experience of one of them in obtaining Patents, and in the conduct of litigation arising out of Patents for forty years, has been turned to account in the production of the volume.

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