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CONTENTS.

1. THE PATENT OFFICE-ITS ADMINISTRATION, &c.

II. FINANCES AND STATISTICS.
III. CLASSIFIED LIST OF EXPIRED PATENTS.
IV. ALPHABETICAL LIST OF EXPIRED PATENTS.
V. CLASSIFIED LIST OF PATENTS ISSUED.
VI. ALPHABETICAL LIST OF PATENTS ISSUED.

VII. INVENTIONS AND CLAIMS.

VIII. EARLY AMERICAN INVENTIONS.

IX. COMMUNICATIONS.

X. THE WORLD'S EXPOSITION OF 1851.

XI. INFORMATION TO APPLICANTS FOR PATENTS.

WASHINGTON:

ROBBRT ARMSTRONG, PRINTER.

1852.

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CONTENTS

Receipts and Expenditures for 1851.....

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Table exhibiting the business of the Office for the last eleven years......

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Table showing the number of Patents, Re-issues, Designs, and Improvements granted in
1851. .....

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Table showing the number of Patents issued to citizens of different States in 1851...... 25

III. CLASSIFIED LIST OF EXPIRED PATENTS.

Classified List of Patents that have expired in the year 1851......

I.-Agriculture, including Implements and Operations..

II.—Metallurgy and Manufacture of Metals.....

III.-Manufacture of Fibrous and Textile Substances...

IV.-Chemical Processes, Manufactures, and Compounds..

V.-Calorifics, comprising Lamps, Fire-places, Stoves, &c...

VI.-Steam and Gas Engines.....

VII.-Navigation and Maritime Implements...

VIII.—Mathematical, Philosophical, and Optical Instruments....

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