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Creation Date 

1. Before 1985  (7)
2. 1985 To 1990  (25)
3. 1991 To 1996  (49)
4. 1997 To 2003  (66)
5. After 2003  (29)
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Subject 

1. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (90)
2. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (90)
3. General Tagging Of New Technological Developments  (90)
4. Apparatus Therefor  (75)
5. Regeneration Of Pulping Liquors  (74)
6. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (74)
7. Paper Not Otherwise Provided For  (70)
8. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (70)
9. Impregnating Or Coating Of Paper  (70)
10. Pulp Compositions  (70)
11. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (70)
12. Chemistry  (66)
13. Metallurgy  (66)
14. Technical Subjects Covered By Former Uspc  (63)
15. Transporting  (55)
16. Performing Operations  (55)
17. Technical Subjects Covered By Former Uspc Cross-Reference Artcollections [xracs] And Digests  (38)
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Language 

1. French  (1)
2. English  (1)
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