US3896429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Segment decoder for numeric display
Assignee: Raytheon Co
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Filing: 1973-06-25
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Granted: 1975-07-22
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Expires: 1993-06-25
Abstract
Abstract Decoder logic is limited to decoding of BCD digital signals to a seven segment code for numeric characters. Intermediate stages of decoding are utilized and complex MOS implemented gates reduce the logical circuitry for digital display of numeric characters by energizing segments of a seven segment display device.
Inventors
- 👤 Norman E Moyer
- 👤 Dennis E Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G04; G04G; G04G9/00; G04G9/08; H; H03; H03M; H03M7/00; H03M7/02; H03M7/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
192 words
A character segment decoder comprising: an intermediate decoding stage; a final decoding stage of logical gates having inputs for coded character signals for characters of a group of characters and decoded output signals of the intermediate stage, said gates of the final stage having individual outputs corresponding to segments of a display indicator for visual display of the characters; said intermediate stage including a plurality of logical gates having inputs for applying coded character signals representing predetermined characters of the group, each of said intermediate gates sensing a particular subcombination included in said character signals to produce intermediate logical output signals also coupled to respective logical gates of said final stage, said logical gates of the final stage being responsive to logical signals at its inputs to produce said individual outputs corresponding to segments of the display indicator for representing predetermined charaCters of the group of characters; and said intermediate and final stages including interconnections providing for feedback combining logical signals in final and intermediate stages for producing output signals for segments of character to display a character according to selected subcombinations of coded character signals applied to the character display indicator.
Claim 2
Dependent Claim
192 words
A character segment decoder comprising: an intermediate decoding stage; a final decoding stage of logical gates having inputs for coded character signals for characters of a group of characters and decoded output signals of the intermediate stage, said gates of the final stage having individual outputs corresponding to segments of a display indicator for visual display of the characters; said intermediate stage including a plurality of logical gates having inputs for applying coded character signals representing predetermined characters of the group, each of said intermediate gates sensing a particular subcombination included in said character signals to produce intermediate logical output signals also coupled to respective logical gates of said final stage, said logical gates of the final stage being responsive to logical signals at its inputs to produce said individual outputs corresponding to segments of the display indicator for representing predetermined charaCters of the group of characters; and said intermediate and final stages including interconnections providing for feedback combining logical signals in final and intermediate stages for producing output signals for segments of character to display a character according to selected subcombinations of coded character signals applied to the character display indicator.
Claim 3
Dependent Claim
41 words
The character segment decoder according to claim 1 in which said predetermined characters decoded by said intermediate stage comprise characters capable of being displayed by a lesser group of segments of the display indicator than the remaining characters of the group.
Claim 4
Dependent Claim
23 words
The character segment decoder according to claim 2 in which said display indicator includes seven segments for representing any character of the group.
Claim 5
Dependent Claim
44 words
The character segment decoder according to claim 3 in which said display indicator consists of a pair of rectangles with one said segment being common to the boundary of each said rectangle and said group of characters consists of ten numbers 1 to 0.
Claim 6
Dependent Claim
55 words
The character segment decoder according to claim 1 in which said final decoding stage includes complex logical gates formed by P and N-channel transistors forming a final logical level of NOR and NAND gates and a preceding logical level of AND gates having outputs connected to the inputs of gates in the final logical level.
Claim 7
Dependent Claim
38 words
The character segment decoder of claim 5 in which said preceding logical level includes first and second logical gates in sequential stages to provide a complex logical gating network having an inverted output in said final logical level.
Claim 8
Dependent Claim
35 words
The character segment decoder of claim 1 in which a source of blanking signals is provided and coupled to said final decoding stage for blanking the outputs corresponding to the segments of the display indicator.
Claim 9
Dependent Claim
49 words
The character segment decoder of claim 1 in which said logical gates of the final decoding stage further include inputs for said outputs corresponding to segments of the display indicator for utilizing the segment outputs in combination with coded character signals and decoded output signals of the intermediate stage.
Claim 10
Dependent Claim
62 words
The character segment decoder of claim 1 in which said coded characters of the group consist of ten numbers 1 to 0, said coded character signals comprise binary coded decimal signals for numbers 1 to 0, and said final decoding stage provides for the ten numbers 1 to 0 only to produce said individual outputs corresponding to segments of the display indicator.
Claim 11
Dependent Claim
36 words
The character segment decoder of claim 1 in which said group of coded characters consists of ten numbers 1 to 0 and said predetermined characters of the group consist of numbers 4, 0, 1 and 7.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |