US5859599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard
Assignee: Alps Alpine Co Ltd
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Filing: 1997-05-05
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Granted: 1999-01-12
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Expires: 2017-05-05
Abstract
Abstract A keyboard for lowering the power consumption for key code transmission and enhancing the reliability in code transmission. When key codes corresponding to an operated key in the laid out keys are transmitted to a signal processing unit, a status code indicating whether a function key (Shift, Control or Alt key) has been operated is also transmitted at the same time, transmitting no key-on repeat code that is obtained when one key is operated continuously as with a conventional keyboard.
Inventors
- 👤 Sadakazu Shiga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:16
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/023; G06F3/0231
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A keyboard comprising: a key code generating section for generating a key code corresponding to an operated key among a plurality of laid out keys; and a key code transmitting section for transmitting said key code to a signal processing unit; wherein, when transmitting said key code from said key code transmitting section, a status code indicating whether a function key among said plurality of laid out keys is in an operated state is also transmitted and if the operated key is operated continuously, only said status code is transmitted from said key code transmitting section without transmitting said key code.
Claim 2
Dependent Claim
101 words
A keyboard comprising: a key code generating section for generating a key code corresponding to an operated key among a plurality of laid out keys; and a key code transmitting section for transmitting said key code to a signal processing unit; wherein, when transmitting said key code from said key code transmitting section, a status code indicating whether a function key among said plurality of laid out keys is in an operated state is also transmitted and if the operated key is operated continuously, only said status code is transmitted from said key code transmitting section without transmitting said key code.
Claim 3
Dependent Claim
14 words
The keyboard as claimed in claim 1, wherein said status code is transmitted intermittently.
Claim 4
Dependent Claim
21 words
The keyboard as claimed in claim 1, wherein said function key is one of Shift key, Control key, and Alt key.
Claim 5
Dependent Claim
44 words
The keyboard as claimed in claim 1 further comprising an identification code generating section for generating an identification code unique to said keyboard, wherein said identification code is transmitted along with said key code and said status code from said key code transmitting section.
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) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |