Screw vacuum pump

Details Screw vacuum pump Screw vacuum pump

1987-10-15

1989-02-28

Freeh, William L.

Rotary expansible chamber devices

With plural working fluid inlet or outlet passages

418 97, 418 99, F04C 2904, F04C 216

Patent

active

048080950

ABSTRACT:
A screw vacuum pump which includes a pair of screw rotors meshed with each other. The vacuum pump includes an oilless screw vacuum pump suitable for application to industries where air containing foreign matter is detrimental to the products to be produced and for application to the food industry where odorous air must be avoided.

REFERENCES:
patent: 958345 (1910-05-01), Wilkin
patent: 1191423 (1916-07-01), Holdaway
patent: 3112869 (1963-12-01), Aschoff
patent: 3430848 (1969-03-01), Turner
patent: 3574488 (1971-04-01), Vanderstegendrake
patent: 4005949 (1977-02-01), Grant
patent: 4329126 (1982-05-01), Nishimura
patent: 4714418 (1987-12-01), Matsubara
patent: 4727725 (1988-03-01), Nagata

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