Patent US3977484A successfully refreshed from Google Patents.
US3977484A
Expired / Lapsed
US
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Electronic scale apparatus with dead weight calculating means
Assignee: August Sauter KG
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Filing: 1975-05-23
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Granted: 1976-08-31
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Expires: 1995-05-23
Abstract
Abstract An electronic scale apparatus for use in determining the net weight of an object placed on a weighing scale features selecting means operable for generating a digital signal corresponding to the dead weight of the object, digital to analog conversion means coupled to the selecting means and operable for producing a first analog signal corresponding to the digital signal, the weighing scale being operable for producing a second analog signal corresponding to the gross weight of the object, a differential amplifier coupled to the conversion means and to the weighing scale and being operable for producing a third analog signal substantially equal to the difference between the first and second analog signals, whereby the third analog signal represents the net weight of the object.
Inventors
- 👤 Manfred Kammerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:10
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/14; G01G23/16; G01G23/163; Y; Y10; Y10S; Y10S177/00; Y10S177/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
An electronic scale apparatus, for use in determining the net weight of an object including a tare placed on a weighing scale, comprising, in combination: selecting means operable for generating a digital signal corresponding to the dead weight of said tare; digital to analog conversion means coupled to said selecting means and operable for producing a first analog signal corresponding to said digital signal; said weighing scale being operable for producing a second analog signal corresponding to the gross weight of said object; a differential amplifier coupled to said conversion means and to said weighing scale and being operable for producing a third analog signal substantially equal to the difference between said first and second analog signals, whereby said third analog signal represents the net weight of said object.
Claim 2
Dependent Claim
129 words
An electronic scale apparatus, for use in determining the net weight of an object including a tare placed on a weighing scale, comprising, in combination: selecting means operable for generating a digital signal corresponding to the dead weight of said tare; digital to analog conversion means coupled to said selecting means and operable for producing a first analog signal corresponding to said digital signal; said weighing scale being operable for producing a second analog signal corresponding to the gross weight of said object; a differential amplifier coupled to said conversion means and to said weighing scale and being operable for producing a third analog signal substantially equal to the difference between said first and second analog signals, whereby said third analog signal represents the net weight of said object.
Claim 3
Dependent Claim
34 words
The apparatus as claimed in claim 1 further comprising a storage means connected between said selecting means and said conversion means and operable for storing said digital signal for a predetermined period of time.
Claim 4
Dependent Claim
87 words
The apparatus as claimed in claim 1, wherein said selecting means comprises a signal generator operable for generating a digital code in response to a keyboard, a storage device coupled to said signal generator and operable for storing said digital code, a counter coupled to said storage device, and a pulse generator coupled to said counter and operable for producing a pulse signal, said counter storing pulse signals from said pulse generator corresponding to said digital code, whereby the pulses in said counter become said digital signal.
Claim 5
Dependent Claim
39 words
The apparatus as claimed in claim 3, wherein said conversion means comprises a flip-flop coupled to said counter, a reference voltage source, an integrator, and coupling means for coupling said flip-flop and said reference voltage source to said integrator.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |