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Creation Date 

1. Before 1969  (1)
2. 1969 To 1973  (1)
3. 1974 To 1976  (1)
4. 1977 To 1978  (31)
5. After 1978  (80)
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Resource Type 

1. Patents  (112)
2. Articles  (1)
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Subject 

1. Textiles  (105)
2. Production Of Cellulose  (103)
3. Paper-Making  (103)
4. Transporting  (47)
5. Performing Operations  (47)
6. Regeneration Of Pulping Liquors  (43)
7. Apparatus Therefor  (43)
8. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (43)
9. Paper Not Otherwise Provided For  (37)
10. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (37)
11. Impregnating Or Coating Of Paper  (37)
12. Pulp Compositions  (37)
13. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (37)
14. Nailing Or Stapling Machines In General  (33)
15. Working Or Preserving Wood Or Similar Material  (33)
16. Metallurgy  (26)
17. Chemistry  (26)
18. Fibrous Raw Materials Or Their Mechanical Treatment  (26)
19. Methods Of Producing Paper Thereon  (19)
20. Paper-Making Machines  (19)
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