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THE

LAW OF PATENTS

For Inventions,

FAMILIARLY EXPLAINED

FOR THE USE OF

INVENTORS AND PATENTEES.

BY

WILLIAM CARPMAEL, ESQ.,

MEMBER OF THE HONOURABLE SOCIETY OF LINCOLN'S INN, OF THE
INSTITUTION OF CIVIL ENGINEERS, ETC., ETC.

FIFTH EDITION.

LONDON:

SIMPKIN, MARSHALL, AND CO.,

STATIONERS' HALL COURT;

AND WEALE, HIGH HOLBORN.

1852.

ALEX. MACINTOSH,

PRINTER,

GREAT NEW-STREET, LONDON.

THECA

વાઇ

ADVERTISEMENT.

A FIFTH Edition of this Work being called for by reason of the new Statute, the Author has made such alterations and additions as have become necessary, in order that the extensive changes made in the mode of granting Letters Patent for Inventions may be understood.

In former Editions of this Work, the Author, in citing judgments given in the Courts of Law in Patent cases, referred to the numerous Law Books containing the published reports, but few, if any, patentees, manufacturers, or inventors, could have the opportunity of reading them. The Author has for many years had in his possession a Manuscript collection of Law Reports of Patent cases, many of which had not been printed, and he has lately published a large proportion of these cases in the

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Repertory of Patent Inventions," a work of easy reference to manufacturers and inventors; and in the present volume, the Author, in addition to stating where the cases can be found in the Law Books, has also referred to his own Reports, by which the patentee, the manufacturer, and the inventor, may turn to any case cited, and judge for himself as to the general tenour of the judgment given in a particular

case.

LINCOLN'S INN,
October, 1852.

PREFACE TO THE FIRST EDITION.

AMONGST the various publications, which at present treat of the Laws relating to Patents for Inventions, it is surprising that no popular work, adapted to the use of inventors and patentees, has made its appearance, particularly when we reflect that they have to suffer from any want of judgment in obtaining grants from the Crown to protect new inventions.

To supply this defect is the object of the present work; and it has been the desire of the Author to explain, in a familiar manner, the nature of Letters Patent, and the laws which relate to this description of property.

The many years the Author has been engaged in the study of mechanical science, and in giving advice to inventors and patentees, as to the best means of securing to themselves a recompense for their ingenuity, have made him acquainted with the description of information most generally required by that class of persons; and, at the same time, with the know

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