Weighing devices using electronic circuitry
US4350216A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Sep 11, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S177/03
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A bathroom scale which uses an electronic circuit for providing a digital output voltage in response to the placing of a weight thereon, the electronic circuit having operational amplifier circuits which use both a positive power supply and a negative power supply, the latter assuring that the op-amps always return to a stabilized ground reference point to assure repeatability of weight measurement. The unit includes means for permitting the digital output voltage to reach a steady state value during a selected time period after a weight is placed on the scale and for preventing such steady state value from changing after such selected time period. The gain of the op-amp circuitry is adjustable to permit scale calibration to be performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.