CONTENTS 



Page 



I INTRODUCTION 7 



II INFORMATION IN PATENTS 9 



III FINDING PATENTS 11 



IV PATENT SELECTION FOR THE COLLECTION 14 



V INDEXING THE COLLECTION 17 



1. The Keywords 17 



2. Assignment o£ Keywords to Patents 29 



VI THE BIBLIOGRAPHY 29 



1. Information in the Annotations 29 



2. Use of the Title List 36 



3. Use of the Subject Index 36 



VII SUMflARY 44 



TABLES 



1 Libraries having copies of the CERC patent bibliography .... 8 



2 Libraries having patent collections 13 



3 Patent classes searched 15 



4 Revised codes for "Hydraulic and Earth Engineering" from 



the Manual of Classification of Patents 45 



FIGURES 



1 Typical front page of a patent document 10 



2 Typical page from the Manual of Classification of Patents 



before 1979 revision 12 



3 Typical page from the Official Gazette 16 



4 Typical annotations for original patents issued before 1969 . . 31 



5 Typical annotations for original patents issued since 1969. . . 32 



6 Additional examples of annotations for original patents .... 33 



7 Typical annotations for reissued patents 34 



8 Additional examples of annotations for reissued patents .... 35 



4 



