Vacuum cleaning system
United States Patent 3240000
US Patent References:
Automatic automotive air filter
- - 2238280

Vacuum cleaner
- - 2295984

Dust separator
- - 2323405

Multiple hydrocyclone
- - 2765918

Central vacuum cleaning system
- - 2825921


Inventors:
Hayes, Rex S.
Farley F. E.
Publication Date:
03/15/1966
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Assignee:
JOHN E MITCHELL COMPANY
Primary Class:
55/337
Other Classes:
55/459.100, 15/314, 55/498, 15/422.200, 417/423.200, 55/472
International Classes:
A47L5/38; A47L5/22
US Patent References:
2943698
3032955Vacuum cleaners
3046718Suction cleaner
Foreign References:
DE631580C
GB761710A
IT458191B