Presses – With drain means for expressed liquid – Drainage through or along pressure surface
Reexamination Certificate
2006-12-05
2006-12-05
Larson, Lowell A. (Department: 3725)
Presses
With drain means for expressed liquid
Drainage through or along pressure surface
C100S037000, C100S145000, C210S414000, C210S415000, C210S770000
Reexamination Certificate
active
07143690
ABSTRACT:
The invention relates to a screw compressor for compressing matter that passes through the screw compressor. The screw compressor comprises a screw having an outer thread with a pitch that decreases in the longitudinal direction of the screw, and a casing that encases the screw. The casing has an inner side that faces the thread of the screw so that matter may be passed ahead through the screw compressor between the screw and the inner side of the casing in a direction from an inlet end of the screw compressor, where the pitch of the screw thread is greater, to an outlet end of the screw compressor, where the pitch of the screw thread is smaller. Appliances are arranged on the inner side of the casing to prevent matter that passes through the screw compressor from rotating along with the screw. Inside the screw, a conduit is arranged for introduction of liquid. The invention also relates to a method for compressing and dewatering.
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patent: 808193 (1905-12-01), Bussells
patent: 1382056 (1921-06-01), Bontemps et al.
patent: 2355091 (1944-08-01), McDonald
patent: 3044391 (1962-07-01), Pellett
patent: 4041854 (1977-08-01), Cox
patent: 4838995 (1989-06-01), Klausen
patent: 2908842 (1980-09-01), None
patent: 0988962 (2000-03-01), None
patent: WO 9630198 (1996-10-01), None
Börjesson Lennart
Eriksson Roland
Kilpatrick & Stockton LLP
Mastec Stålvall Aktiebolag
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