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1. Before 1988  (16)
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Resource Type 

1. Patents  (72)
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Subject 

1. Chemistry  (72)
2. Textiles  (56)
3. Production Of Cellulose  (56)
4. Paper-Making  (56)
5. Paper Not Otherwise Provided For  (46)
6. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (46)
7. Impregnating Or Coating Of Paper  (46)
8. Pulp Compositions  (46)
9. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (46)
10. Treatment Of Water, Waste Water, Sewage, Or Sludge  (33)
11. Compositions Based Thereon  (21)
12. Their Preparation Or Chemical Working-Up  (21)
13. Organic Macromolecular Compounds  (21)
14. Regeneration Of Pulping Liquors  (15)
15. Apparatus Therefor  (15)
16. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (15)
17. General Processes Of Compounding  (10)
18. Fertilisers  (10)
19. After-Treatment Not Covered By Subclasses C08b, C08c, C08f,c08g  (10)
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Databases 

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2. ProQuest Central  (1)
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