US3594565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Round off apparatus for electronic calculators
Assignee: Singer Co
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Filing: 1968-05-31
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Granted: 1971-07-20
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Expires: 1988-05-31
Abstract
Abstract Rounding off numbers in a desk top electronic calculator having a data train that recirculates in accordance with a predetermined sequence is accomplished by sensing whether the numeral in the next least significant digit position following the least significant digit position of interest is five or greater when it occurs in a predetermined location of the data train. When the numeral is five or greater, this condition is temporarily stored. Gating means coupled to the storage and to control signals indicative of the occurrence of the least significant digit position of interest in a predetermined location of the data train enables the numeral in the least significant digit position of interest to be increased by one. Much of the circuitry utilized to perform round off is also used to perform a carry function as arithmetically required.
Inventors
- 👤 Robert A Ragen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:58
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/491; G06F15/00; G06F15/02; G06F7/499; G06F7/49942; G06F7/49947
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
277 words
Apparatus for rounding off a number comprising: a memory having a plurality of registers each capable of storing a number having a plurality of digits, means for successively recirculating the digits of at least some of said numbers through a closed loop which includes said memory to provide a serial recirculating data train with a predetermined time interval between the end of said data train and the beginning of said data train, said closed loop including a temporary single digit storage device, said single digit storage device providing a first output when the digit therein is greater than 4, a first bistable device outside of said closed loop, first gating means coupled between said first output of said digit storage device and said first bistable device for causing said first bistable device to be placed into a predetermined one of its stable states when the digit following the least significant digit of interest of a number is greater than 4 when it appears in said digit storage device, a second bistable device, second gating means coupled between said first and second bistable devices for causing said second bistable device to be placed into a predetermined one of its stable states during said predetermined interval when said first bistable device indicates said digit following the least significant digit of interest is greater than 4, and third gating means coupled between said second bistable device and said digit storage device to cause said least significant digit of interest to be incremented by one when it occurs in said digit storage device and when said second bistable device indicates the digit following said least significant digit is greater than 4.
Claim 2
Dependent Claim
277 words
Apparatus for rounding off a number comprising: a memory having a plurality of registers each capable of storing a number having a plurality of digits, means for successively recirculating the digits of at least some of said numbers through a closed loop which includes said memory to provide a serial recirculating data train with a predetermined time interval between the end of said data train and the beginning of said data train, said closed loop including a temporary single digit storage device, said single digit storage device providing a first output when the digit therein is greater than 4, a first bistable device outside of said closed loop, first gating means coupled between said first output of said digit storage device and said first bistable device for causing said first bistable device to be placed into a predetermined one of its stable states when the digit following the least significant digit of interest of a number is greater than 4 when it appears in said digit storage device, a second bistable device, second gating means coupled between said first and second bistable devices for causing said second bistable device to be placed into a predetermined one of its stable states during said predetermined interval when said first bistable device indicates said digit following the least significant digit of interest is greater than 4, and third gating means coupled between said second bistable device and said digit storage device to cause said least significant digit of interest to be incremented by one when it occurs in said digit storage device and when said second bistable device indicates the digit following said least significant digit is greater than 4.
Claim 3
Dependent Claim
124 words
The apparatus of claim 1 wherein said digit storage device provides a second output when a digit therein is incremented from 9 to 0, fourth gating means coupled between said second output of said digit storage device and said first bistable device to place said first bistable device into said predetermined one of its stable states when a Digit is incremented from 9 to 0 while in said digit storage device, fifth gating means coupled between said first bistable device and said digit storage device to increment the next most significant digit by one when it occurs in said digit storage device and when said first bistable device indicates that the digit in said digit storage device has been incremented from 9 to 0.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein, said closed loop includes said memory.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein, the digit positions of numbers recirculated are interlaced.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein, said memory includes an acoustic delay line.
Claim 7
Dependent Claim
185 words
Apparatus for rounding off a number comprising: a memory having a plurality of registers each capable of storing a number having a plurality of digits, means for successively recirculating the digits of at least some of said numbers through a closed loop which includes said memory to provide a serial recirculating data train, said closed loop including a first temporary single digit storage device, a second temporary single digit storage device coupled to said first digit storage device and not in said closed loop for having the digit following the least significant digit of interest of a number nondestructively copied therein when said digit occurs in said first digit storage device, said second digit storage device providing an output when the digit therein is greater than 4, and first gating means coupled between said second digit storage device and said first digit storage device to cause said least significant digit of interest to be incremented by one when it occurs in said first digit storage device and when said second digit storage device indicates the digit following said least significant digit is greater than 4.
Claim 8
Dependent Claim
185 words
Apparatus for rounding off a number comprising: a memory having a plurality of registers each capable of storing a number having a plurality of digits, means for successively recirculating the digits of at least some of said numbers through a closed loop which includes said memory to provide a serial recirculating data train, said closed loop including a first temporary single digit storage device, a second temporary single digit storage device coupled to said first digit storage device and not in said closed loop for having the digit following the least significant digit of interest of a number nondestructively copied therein when said digit occurs in said first digit storage device, said second digit storage device providing an output when the digit therein is greater than 4, and first gating means coupled between said second digit storage device and said first digit storage device to cause said least significant digit of interest to be incremented by one when it occurs in said first digit storage device and when said second digit storage device indicates the digit following said least significant digit is greater than 4.
Claim 9
Dependent Claim
127 words
The apparatus of claim 6 wherein, said first digit storage device provides an output when a digit therein is incremented from 9 to 0, a bistable device, Second gating means coupled between said output of said first digit storage device and said bistable device to place said bistable device into a predetermined one of its stable states when a digit is incremented from 9 to 0 while in said first digit storage device third gating means coupled between said bistable device and said first digit storage device to increment the next most significant digit by one when it occurs in said first digit storage device and when said bistable device indicates that the digit in said first digit storage device has been incremented from 9 to 0.
Claim 10
Dependent Claim
12 words
The apparatus of claim 6 wherein, said closed loop includes said memory.
Claim 11
Dependent Claim
14 words
The apparatus of claim 6 wherein, the digit position of members recirculated are interlaced.
Claim 12
Dependent Claim
13 words
The apparatus of claim 6 wherein, said memory includes an acoustic delay line.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |