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Creation Date 

1. Before 1977  (8)
2. 1977 To 1990  (17)
3. 1991 To 1995  (40)
4. 1996 To 2002  (33)
5. After 2002  (6)
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Subject 

1. Textiles  (100)
2. Production Of Cellulose  (97)
3. Paper-Making  (97)
4. Regeneration Of Pulping Liquors  (73)
5. Apparatus Therefor  (73)
6. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (73)
7. Chemistry  (26)
8. Metallurgy  (26)
9. Paper Not Otherwise Provided For  (20)
10. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (20)
11. Impregnating Or Coating Of Paper  (20)
12. Pulp Compositions  (20)
13. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (20)
14. Transporting  (16)
15. Performing Operations  (16)
16. Biochemistry  (9)
17. Compositions Thereof  (9)
18. Beer  (9)
19. Enzymology  (9)
20. Culture Media  (9)
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