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Creation Date 

1. Before 1982  (33)
2. 1982 To 1987  (33)
3. 1988 To 1993  (24)
4. 1994 To 2000  (32)
5. After 2000  (10)
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Subject 

1. Regeneration Of Pulping Liquors  (92)
2. Apparatus Therefor  (92)
3. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (92)
4. Paper Not Otherwise Provided For  (32)
5. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (32)
6. Impregnating Or Coating Of Paper  (32)
7. Pulp Compositions  (32)
8. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (32)
9. Transporting  (30)
10. Performing Operations  (30)
11. Chemistry  (26)
12. Metallurgy  (26)
13. Fibrous Raw Materials Or Their Mechanical Treatment  (23)
14. Physical Or Chemical Processes Or Apparatus In General  (18)
15. Separation  (15)
16. Methods Of Producing Paper Thereon  (9)
17. Paper-Making Machines  (9)
18. More options