Refine My Results

Creation Date 

1. Before 1977  (5)
2. 1977 To 1980  (6)
3. 1981 To 1985  (6)
4. 1986 To 1989  (12)
5. After 1989  (3)
6. More options 

Subject 

1. Paper Not Otherwise Provided For  (13)
2. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (13)
3. Impregnating Or Coating Of Paper  (13)
4. Pulp Compositions  (13)
5. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (13)
6. Transporting  (10)
7. Performing Operations  (10)
8. Regeneration Of Pulping Liquors  (9)
9. Apparatus Therefor  (9)
10. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (9)
11. Fibrous Raw Materials Or Their Mechanical Treatment  (8)
12. Methods Of Producing Paper Thereon  (5)
13. Paper-Making Machines  (5)
14. Metallurgy  (4)
15. Chemistry  (4)
16. Compositions Based Thereon  (3)
17. After-Treatment Not Covered By Subclasses C08b, C08c, C08f,c08g  (3)
18. More options