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Creation Date 

1. Before 1991  (28)
2. 1991 To 1999  (29)
3. 2000 To 2007  (39)
4. 2008 To 2016  (130)
5. After 2016  (162)
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Subject 

1. Textiles  (310)
2. Production Of Cellulose  (305)
3. Paper-Making  (305)
4. Paper Not Otherwise Provided For  (201)
5. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (201)
6. Impregnating Or Coating Of Paper  (201)
7. Pulp Compositions  (201)
8. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (201)
9. Regeneration Of Pulping Liquors  (86)
10. Apparatus Therefor  (86)
11. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (86)
12. Methods Of Producing Paper Thereon  (74)
13. Paper-Making Machines  (74)
14. Chemistry  (72)
15. Metallurgy  (72)
16. Transporting  (52)
17. Performing Operations  (52)
18. Treatment Of Water, Waste Water, Sewage, Or Sludge  (33)
19. Treatment Of The Materials Before Passing To The Paper-Makingmachine  (31)
20. Fibrous Raw Materials Or Their Mechanical Treatment  (31)
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Language 

1. English  (347)
2. Chinese  (249)
3. French  (5)
4. Norwegian  (5)
5. Swedish  (4)
6. Finnish  (4)
7. Russian  (3)
8. Danish  (3)
9. German  (3)
10. Spanish  (1)
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