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Creation Date 

1. Before 2003  (2)
2. 2003 To 2011  (5)
3. 2012 To 2013  (10)
4. 2014 To 2017  (4)
5. After 2017  (15)
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Subject 

1. Paper Not Otherwise Provided For  (23)
2. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (23)
3. Impregnating Or Coating Of Paper  (23)
4. Pulp Compositions  (23)
5. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (23)
6. Regeneration Of Pulping Liquors  (18)
7. Apparatus Therefor  (18)
8. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (18)
9. Methods Of Producing Paper Thereon  (7)
10. Paper-Making Machines  (7)
11. Chemistry  (6)
12. Metallurgy  (6)
13. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (4)
14. Performing Operations  (4)
15. Technologies Or Applications For Mitigation Or Adaptation Againstclimate Change  (4)
16. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (4)
17. General Tagging Of New Technological Developments  (4)
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