US4850442A
Expired / Lapsed
US
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Zero-point adjustment of weighing device
Assignee: Ishida Scales Manufacturing Co Ltd
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Filing: 1988-05-19
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Granted: 1989-07-25
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Expires: 2008-05-19
Abstract
Abstract A zero-point adjustment unit for a weighing device is comprised of a rough adjustment circuit, a fine adjustment circuit and a central processing unit. The central processing unit adjusts the zero-point of the weighing device by receiving a no-lead weight signal outputted from the weighing device and controls the output signals from the rough and fine adjustment circuits.
Inventors
- 👤 Kazufumi Naito
- 👤 Setsuo Haze
- 👤 Hideo Nobutugu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:50
CPC Classifications
G; G01; G01G; G01G19/00; G01G19/387; G01G19/393; G01G19/22; G01G19/32; G01G23/00; G01G23/01; G01G23/14; G01G23/16; G01G23/163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
A zero-point adjustment unit for a weighing device comprising a rough adjustment circuit, a fine adjustment circuit, and a central processing unit adapted to adjust the zero-point of said weighing device by receiving a no-load weight signal outputted from said weighing device and controlling the output signals from said rough and fine adjustment circuits.
Claim 2
Dependent Claim
54 words
A zero-point adjustment unit for a weighing device comprising a rough adjustment circuit, a fine adjustment circuit, and a central processing unit adapted to adjust the zero-point of said weighing device by receiving a no-load weight signal outputted from said weighing device and controlling the output signals from said rough and fine adjustment circuits.
Claim 3
Dependent Claim
51 words
The zero-point adjustment unit of claim 1 wherein said rough adjustment circuit includes a first digital-to-analog converter for rough zero-point adjustment and a first subtracter for rough zero-point adjustment, and said fine adjustment circuit includes a second digital-to-analog converter for fine zero-point adjustment and a second subtracter for fine zero-point adjustment.
Claim 4
Dependent Claim
84 words
The zero-point adjustment unit of claim 2 wherein said rough and fine adjustment circuits include an analog-to-digital converter, said first subtracter serves to receive an output signal from said first digital-to-analog converter and an analog no-load signal from said weighing device and to correspondingly output a first difference signal, and said second subtracter serves to receive an output signal from said second digital-to-analog converter and an output signal from said first subtracter and to correspondingly output a second difference signal to said analog-to-digital converter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |