US4934852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable color display typewriter
Assignee: Individual
•
Filing: 1989-04-11
•
Granted: 1990-06-19
•
Expires: 2009-04-11
Abstract
Abstract A typewriter with variable color display visually presents typed text in a color variable in accordance with the typing speed and accuracy.
Inventors
- 👤 Karel Havel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:09
CPC Classifications
B; B41; B41J; B41J3/00; B41J3/44; B41J3/46; G; G09; G09F; G09F9/00; G09F9/30; G09F9/33
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A method of simultaneously displaying a typed text and indicating a typing speed and a typing accuracy, on a variable color display means, by causing the typed text to be visually presented on said display means, by determining the typing speed, by verifying the typing accuracy, and by controlling the color of said display means in accordance with both typing speed and typing accuracy.
Claim 2
Independent Claim
64 words
A method of simultaneously displaying a typed text and indicating a typing speed and a typing accuracy, on a variable color display means, by causing the typed text to be visually presented on said display means, by determining the typing speed, by verifying the typing accuracy, and by controlling the color of said display means in accordance with both typing speed and typing accuracy.
Claim 3
Dependent Claim
40 words
The method as defined in claim 1 wherein the color of said display means may be controlled substantially continuously such that the color changes of said display means are proportional to changes in the typing speed and the typing accuracy.
Claim 4
Dependent Claim
22 words
The method as defined in claim 1 wherein the color of said display means may be controlled in a plurality of steps.
Claim 5
Independent Claim
65 words
An apparatus for indicating a typing speed and a typing accuracy comprising: keyboard means for selectively typing characters at a selective typing speed; variable color display means for visually presenting typed characters; means for determining the typing speed; means for verifying the typing accuracy; and color control means for controlling the color of said display means in accordance with both typing speed and typing accuracy.
Claim 6
Independent Claim
65 words
An apparatus for indicating a typing speed and a typing accuracy comprising: keyboard means for selectively typing characters at a selective typing speed; variable color display means for visually presenting typed characters; means for determining the typing speed; means for verifying the typing accuracy; and color control means for controlling the color of said display means in accordance with both typing speed and typing accuracy.
Claim 7
Dependent Claim
42 words
The apparatus as defined in claim 4 wherein said color control means control the color of said display means substantially continuously such that the color changes of said display means are proportional to changes in the typing speed and the typing accuracy.
Claim 8
Dependent Claim
24 words
The apparatus as defined in claim 4 wherein said color control means control the color of said display means in a plurality of steps.
Claim 9
Independent Claim
75 words
An apparatus for indicating a typing speed and a correct spelling of typed words comprising: keyboard means for selectively typing words at a selective typing speed; variable color display means for visually presenting typed words; means for determining the typing speed; means for verifying correct spelling of the typed words; and color control means for controlling the color of said display means in accordance with both typing speed and correct spelling of the typed words.
Claim 10
Independent Claim
75 words
An apparatus for indicating a typing speed and a correct spelling of typed words comprising: keyboard means for selectively typing words at a selective typing speed; variable color display means for visually presenting typed words; means for determining the typing speed; means for verifying correct spelling of the typed words; and color control means for controlling the color of said display means in accordance with both typing speed and correct spelling of the typed words.
Claim 11
Independent Claim
153 words
An apparatus for determining a typing speed and a typing accuracy comprising: keyboard means for selectively typing characters at a selective typing speed; variable color display means for visually presenting typed characters; color memory means for storing a code, said memory means having a memory output indicative of the value of said code; central processor means for measuring a typing speed and for accordingly storing in said color memory means a code representing a selected color, and for performing a verification of the typing accuracy and for accordingly modifying the code stored in said memory means and representing the selected color, when an incorrectly typed character is detected, to obtain a modified code representing a different color; and color control means responsive to said memory output for controlling the color of said display means in accordance with the code stored in said memory means, to thereby indicate both typing speed and typing accuracy.
Claim 12
Independent Claim
153 words
An apparatus for determining a typing speed and a typing accuracy comprising: keyboard means for selectively typing characters at a selective typing speed; variable color display means for visually presenting typed characters; color memory means for storing a code, said memory means having a memory output indicative of the value of said code; central processor means for measuring a typing speed and for accordingly storing in said color memory means a code representing a selected color, and for performing a verification of the typing accuracy and for accordingly modifying the code stored in said memory means and representing the selected color, when an incorrectly typed character is detected, to obtain a modified code representing a different color; and color control means responsive to said memory output for controlling the color of said display means in accordance with the code stored in said memory means, to thereby indicate both typing speed and typing accuracy.
Claim 13
Independent Claim
155 words
An apparatus for indicating a typing speed and a correct spelling of typed words comprising: keyboard means for selectively typing words at a selective typing speed; variable color display means for visually presenting typed words; color memory means for storing a code, said memory means having a memory output indicative of the value of said code; central processor means for measuring a typing speed and for accordingly storing in said color memory means a code representing a selected color, for performing a verification of the typed words for correct spelling, and, in accordance with the result of such verification, when a misspelled typed word is discovered, for conveying a different code to said color memory means; and color control means responsive to said memory output for controlling the color of said display means in accordance with the code stored in said memory means, to thereby indicate both typing speed and correct spelling of typed words.
Claim 14
Independent Claim
155 words
An apparatus for indicating a typing speed and a correct spelling of typed words comprising: keyboard means for selectively typing words at a selective typing speed; variable color display means for visually presenting typed words; color memory means for storing a code, said memory means having a memory output indicative of the value of said code; central processor means for measuring a typing speed and for accordingly storing in said color memory means a code representing a selected color, for performing a verification of the typed words for correct spelling, and, in accordance with the result of such verification, when a misspelled typed word is discovered, for conveying a different code to said color memory means; and color control means responsive to said memory output for controlling the color of said display means in accordance with the code stored in said memory means, to thereby indicate both typing speed and correct spelling of typed words.
Claim 15
Dependent Claim
41 words
The apparatus as defined in claim 9 wherein, when a misspelled word is discovered, said central processor means convey a code to said color memory means for changing the color of said display means to effectively decrease the indicated typing speed.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |