Free piston type paraffin scraper
United States Patent 3394763
US Patent References:
Drill pipe cleaner
- - 2257080

Plunger construction
- - 2661024

Paraffin scraper
- - 2785757

Paraffin control device
- - 3329211


Inventors:
Page Jr., Charles B.
Publication Date:
07/30/1968
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Assignee:
TEXACO INC
Primary Class:
166/170
Other Classes:
166/311, 15/104.180
International Classes:
E21B37/04; E21B37/00