Sump pump control system
US4222711A · kind A · utility
96Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Jun 22, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D15/0218
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An AC driven pump and a DC driven pump are positioned in a sump and respectively energized as the liquid in the sump reaches two different levels, the DC driven pump being automatically tested for operation after every predetermined number of pumping cycles of the AC driven pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.