Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate
2003-10-02
2008-03-04
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
C418S001000, C418S150000, C418S201100, C417S410400, C310S112000, C310S103000
Reexamination Certificate
active
07338266
ABSTRACT:
A screw pump includes a pair of screw rotors (2a,2b) having teeth which are held in mesh with each other for drawing and discharging a fluid by rotating the screw rotors (2a,2b) synchronously in opposite directions. The teeth of the screw rotors (2a,2b) have the same shape as each other and are coiled helically in opposite directions. The teeth of the screw rotors (2a,2b) have an axial tooth profile which allows a pair of facing teeth surfaces T of the screw rotors (2a,2b) to be brought into contact with each other only at a pitch line P when the pair of facing teeth surfaces T are brought into contact with each other.
REFERENCES:
patent: 2511878 (1950-06-01), Rathman
patent: 2530173 (1950-11-01), Oldberg
patent: 3164099 (1965-01-01), Iyoi
patent: 5697772 (1997-12-01), Kawamura et al.
patent: 5814913 (1998-09-01), Ojima et al.
patent: 112104 (1917-12-01), None
patent: 419338 (1934-11-01), None
patent: 8-149766 (1996-06-01), None
patent: 8-189485 (1996-07-01), None
patent: 8-254193 (1996-10-01), None
patent: 8-277790 (1996-10-01), None
patent: 2000-50615 (2000-02-01), None
patent: 2001-37175 (2001-02-01), None
Matake Kozo
Miyashita Nobuhito
Ebara Corporation
Ebara Densan Ltd.
Trieu Theresa
Westerman, Hattori, Daniels & Adrian , LLP.
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