presented with any deletions in brackets. Additions, ranging from single 

 words to complete new abstracts, are in italics. The annotations for pat- 

 ent 3,601,999 at the top of Figure 5 and for its reissue. Re. 28,232, in 

 Figure 7 demonstrate the way changes in the abstract are designated. The 

 annotations for patent 3,708,982 at the bottom of Figure 6 and for its 

 reissue. Re. 28,966 at the bottom of Figure 8 show how a change in illus- 

 trative figure is described. 



Several original patents annotated in Volumes 1 or II were reissued 

 during periods covered by the other volumes. Information on these reis- 

 sued editions is included in Volumes I and II as the sections "Refer- 

 enced Reissued Patents" and "Additional Referenced Reissued Patents," 

 respectively. Figure 9 is the complete section from Volume II. The 

 reissued patents described in these sections are not included in the 

 indexes of their respective volumes. As can be seen from comparison of 

 the notes on reissued patents Re. 28,232, Re. 28,332, and Re. 28,966 in 

 Figure 9 to the annotations for these reissued patents in Figures 7 and 

 8, each entry includes, in a format similar to the annotations, informa- 

 tion on the original patent, the application for reissue, the date of 

 reissue, and the changes in the classification codes or keywords. If 

 an abstract or figure was added or revised, the entry includes the new 

 information. 



2. Use of the Title List . 



The list of titles and numbers in each volume, arranged in numerical 

 order with reissued patents at the end of the list, may be used to deter- 

 mine whether a patent is in the collection when the patent number is 

 available from an outside source. Figure 10 is an example page of the 

 title list from Volume III. As an example of its use, assume that an 

 article on floating breakwaters mentions a patent 3,991,576. As dis- 

 cussed above, this number falls in the range covered by Volume III. 

 Refer to the title list in Volume III and find, as shown in Figure 10, 

 that patent 3,991,576 is in the collection. 



^. Use of the Subject Index . 



The subject index in each volume is used to find patents related to 

 a chosen topic. To enter the index, first find the keywords related to 

 the topic by referring to the listing of keyword definitions in this 

 report or in Section II of the first volume of the appendix. Next, 

 search the subject index of each volume to find the lists of information 

 on patents referenced to the selected keywords. Figures 11 and 12 are 

 excerpts from the subject indexes of Volumes III and I, respectively. 

 Notice that the number, title, and other assigned keywords are given for 

 each patent. The other assigned keywords are included for their des- 

 criptive value to aid identification of the many patents with general 

 titles, such as "Offshore Structure," or with titles using ill defined 

 terms, such as "Jetty." To select interesting patents, examine the title 

 and the other keywords for each patent listed under a chosen keyword; 

 then, for the most promising patents, use the patent numbers to find the 



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