Boots – shoes – and leggings
Patent
1988-01-11
1990-04-17
MacDonald, Allen
Boots, shoes, and leggings
364509, 210 97, 210143, F04B 4900
Patent
active
049185853
ABSTRACT:
There is disclosed a maintenance reminder system for a pump. The system of the invention is coupled to the pump or the control system for the pump and determines the volume of fluid pumped by the pump. In the preferred embodiment, a piston pump is used and piston strokes are counted and converted to total volume of liquid pumped. The computer of the system maintains a database for each maintenance item containing the threshold value for each item and the total volume pumped since the last maintenance. When the total volume exceeds the threshold, a maintenance reminder is displayed and the user may display information from the database as to which item needs service. The computer updates the appropriate fields of the database after the service is performed.
REFERENCES:
patent: 3896827 (1975-07-01), Robinson
patent: 4128476 (1978-12-01), Rock
patent: 4137011 (1979-01-01), Rock
patent: 4512442 (1985-04-01), Moore et al.
patent: 4552513 (1985-11-01), Miller et al.
patent: 4752283 (1988-06-01), Copeland et al.
Spectra Physics SP8700 Solvent Delivery System, 12 pages, published for Spectra-Physics.
Chung Chih-Hua
Honganen Ronald E.
Miller Les A.
Nau Vance J.
MacDonald Allen
Spectra Physics Inc.
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