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US3853267A
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Digital subtraction system and method for determining net weight
Assignee: NAT CONTROLS
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Filing: 1974-02-01
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Granted: 1974-12-10
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Expires: 1994-02-01
Abstract
Abstract Digital subtraction system and method utilizing unidirectional counters which has particular utility in determining net weight from gross weight and tare weight. The gross weight and tare weight can be either positive or negative, and both the polarity and the magnitude of the difference are displayed. Either the gross weight or the tare weight can be displayed if desired, and a double subtraction can be performed to determine changes in net weight.
Inventors
- 👤 R Cadwell
- 👤 F Rock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:40
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/14; G01G23/16; G01G23/163
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
299 words
In apparatus for determining the net weight of a load on a scale from signals representing gross weight and tare weight: A. first and second digital counters; B. a source of clock pulses; C. means for providing a timing signal defining a counting period having a duration corresponding to the gross weight signal; D. means for comparing the signs of the gross weight and tare weight signals; E. means for storing the sign of the tare weight signal at the outset of the counting period; F. means for 1. applying the clock pulses initially to the first counter if the signs compared are the same, a. if the count in the first counter reaches a level corresponding to the tare signal prior to the end of the counting period, applying the clock pulses to the second counter for the remainder of the counting period, b. if the count in the first counter does not reach the level corresponding to the tare signal by the end of the counting period, changing the polarity of the stored sign and applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; 2. applying the clock pulses initially to the second counter from the outset of the counting period to the end of the counting period if the signs compared are different, a. changing the polarity of the stored sign at the end of the counting period, and b. thereafter applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; and G. means for displaying the stored sign and the final count in the second counter to indicate the net weight of the load.
Claim 2
Dependent Claim
299 words
In apparatus for determining the net weight of a load on a scale from signals representing gross weight and tare weight: A. first and second digital counters; B. a source of clock pulses; C. means for providing a timing signal defining a counting period having a duration corresponding to the gross weight signal; D. means for comparing the signs of the gross weight and tare weight signals; E. means for storing the sign of the tare weight signal at the outset of the counting period; F. means for 1. applying the clock pulses initially to the first counter if the signs compared are the same, a. if the count in the first counter reaches a level corresponding to the tare signal prior to the end of the counting period, applying the clock pulses to the second counter for the remainder of the counting period, b. if the count in the first counter does not reach the level corresponding to the tare signal by the end of the counting period, changing the polarity of the stored sign and applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; 2. applying the clock pulses initially to the second counter from the outset of the counting period to the end of the counting period if the signs compared are different, a. changing the polarity of the stored sign at the end of the counting period, and b. thereafter applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; and G. means for displaying the stored sign and the final count in the second counter to indicate the net weight of the load.
Claim 3
Dependent Claim
96 words
applying the clock pulses initially to the second counter from the outset of the counting period to the end of the counting period if the signs compared are different, a. changing the polarity of the stored sign at the end of the counting period, and b. thereafter applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; and G. means for displaying the stored sign and the final count in the second counter to indicate the net weight of the load.
Claim 4
Dependent Claim
96 words
applying the clock pulses initially to the second counter from the outset of the counting period to the end of the counting period if the signs compared are different, a. changing the polarity of the stored sign at the end of the counting period, and b. thereafter applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; and G. means for displaying the stored sign and the final count in the second counter to indicate the net weight of the load.
Claim 5
Dependent Claim
41 words
Apparatus as defined by claim 1 further including means for optionally displaying the sign of the gross weight signal and applying the clock pulses to the second counter throughout the counting period whereby the count displayed corresponds to the gross weight.
Claim 6
Dependent Claim
8 words
changing the polarity of the stored sign, and
Claim 7
Dependent Claim
8 words
changing the polarity of the stored sign, and
Claim 8
Dependent Claim
38 words
if the count in the first counter reaches the level corresponding to the tare signal prior to the end of the counting period, counting the clock signal into a second counter for the remainder of the counting period,
Claim 9
Dependent Claim
38 words
if the count in the first counter reaches the level corresponding to the tare signal prior to the end of the counting period, counting the clock signal into a second counter for the remainder of the counting period,
Claim 10
Dependent Claim
98 words
applying the clock pulses initially to the second counter from the outset of the counting period to the end of the counting period if the signs compared are different, a. changing the polarity of the stored sign at the end of the counting period, and b. thereafter applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the first signals; and G. means for displaying the stored sign and the final count in the second counter to indicate the difference between the first and second numbers.
Claim 11
Dependent Claim
98 words
applying the clock pulses initially to the second counter from the outset of the counting period to the end of the counting period if the signs compared are different, a. changing the polarity of the stored sign at the end of the counting period, and b. thereafter applying the clock pulses to the first and second counters until the count in the first counter reaches the level corresponding to the first signals; and G. means for displaying the stored sign and the final count in the second counter to indicate the difference between the first and second numbers.
Claim 12
Dependent Claim
48 words
thereafter counting the clock signal into the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; and G. displaying the stored sign and the final count in the second counter to indicate the net weight of the load.
Claim 13
Dependent Claim
48 words
thereafter counting the clock signal into the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; and G. displaying the stored sign and the final count in the second counter to indicate the net weight of the load.
Claim 14
Dependent Claim
66 words
if the count in the first counter does not reach the level corresponding to the tare signal by the end of the counting period, a. changing the polarity of the stored sign, and b. counting the clock signal into the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; F. if the signs compared are different,
Claim 15
Dependent Claim
66 words
if the count in the first counter does not reach the level corresponding to the tare signal by the end of the counting period, a. changing the polarity of the stored sign, and b. counting the clock signal into the first and second counters until the count in the first counter reaches the level corresponding to the tare signal; F. if the signs compared are different,
Claim 16
Dependent Claim
52 words
Apparatus as defined by claim 1 further including means for optionally displaying the sign of the tare weight signal and applying the clock pulses to the first and second counters until the count in each reaches the level corresponding to the tare signal whereby the count displayed corresponds to the tare weight.
Claim 17
Dependent Claim
84 words
Apparatus as defined by claim 1 further including a third counter, means for storing a signal corresponding to the net weight at a predetermined time, and means for diverting the clock pulses to the third counter until the count in said third counter reaches a level corresponding to the stored net weight signal, whereby the counT corresponding to the stored net weight signal is subtracted and the count displayed corresponds to the change in the net weight from the net weight at predetermined time.
Claim 18
Independent Claim
74 words
An apparatus for subtracting a first number from a second number: A. first and second digital counters; B. a source of clock pulses; C. means for providing a timing signal defining a counting period having a duration corresponding to the second number; D. means for comparing the signs of the first and second numbers; E. means for storing the sign of the first number at the outset of the counting period; F. means for
Claim 19
Independent Claim
74 words
An apparatus for subtracting a first number from a second number: A. first and second digital counters; B. a source of clock pulses; C. means for providing a timing signal defining a counting period having a duration corresponding to the second number; D. means for comparing the signs of the first and second numbers; E. means for storing the sign of the first number at the outset of the counting period; F. means for
Claim 20
Dependent Claim
84 words
In a method for determining the net weight of a load from signals representing gross weight and the tare weight of a system on which the load is weighed, the steps of: A. providing a timing signal defining a counting period having a duration corresponding to the gross weight signal; B. providing a clock signal; C. comparing the signs of the gross weight and tare weight signals; D. storing the sign of the tare weight signal; E. if the signs compared are the same,
Claim 21
Dependent Claim
84 words
In a method for determining the net weight of a load from signals representing gross weight and the tare weight of a system on which the load is weighed, the steps of: A. providing a timing signal defining a counting period having a duration corresponding to the gross weight signal; B. providing a clock signal; C. comparing the signs of the gross weight and tare weight signals; D. storing the sign of the tare weight signal; E. if the signs compared are the same,
Claim 22
Dependent Claim
79 words
The method defined by claim 6 further including the steps of storing a signal corresponding to the net weight at a predetermined time and diverting clock pulses to a third counter until the count in said third counter reaches a level corresponding to the stored net weight signal, whereby the count corresponding to the net weight signal is subtracted and the count displayed corresponds to the change in the net weight from the nEt weight at the predetermined time.
Claim 23
Dependent Claim
53 words
The method defined by claim 6 further including the steps of applying the clock pulses to the first and second counters until the count in each reaches the level corresponding to the tare signal, and displaying the sign of the tare weight signal and the last named count to indicate the tare weight.
Claim 24
Dependent Claim
41 words
The method defined by claim 6 further including the steps of displaying the sign of the gross weight signal and applying the clock pulses to the second counter throughout the counting period whereby the count displayed corresponds to the gross weight.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |