Patent US3673711A successfully refreshed from Google Patents.
US3673711A
Expired / Lapsed
US
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Method of and apparatus for visual instruction
Assignee: Individual
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Filing: 1971-01-04
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Granted: 1972-07-04
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Expires: 1991-01-04
Abstract
Abstract An apparatus for visual instruction comprises a substantially planar translucent screen having an observation surface and a reverse surface, a writing instrument for writing alphanumeric characters on one surface of the screen with an erasable writing medium, and means for illuminating the observation surface of the screen. The instruction apparatus further comprises means for enhancing the visibility of selected characters with respect to the rest, for example a series of reflecting blocks of white Styrofoam, of dimensions corresponding to predetermined characters and groups of characters, such blocks being adapted to be held on the reverse surface of the screen in registration with a selected character or characters.
Inventors
- 👤 Dolores J English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:09
CPC Classifications
G; G09; G09B; G09B17/00; G09B5/00; G09B5/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
The method of visual instruction utilizing a substantially planar translucent screen having an observation surface and a reverse surface comprising: writing alphanumeric characters on one surface of the screen with an erasable writing medium; illuminating the observation surface of the screen; and enhancing the visibility of selected characters with respect to the rest by holding a reflecting block on the reverse surface of the screen having dimensions and disposed to register with a selected character or characters.
Claim 2
Independent Claim
77 words
The method of visual instruction utilizing a substantially planar translucent screen having an observation surface and a reverse surface comprising: writing alphanumeric characters on one surface of the screen with an erasable writing medium; illuminating the observation surface of the screen; and enhancing the visibility of selected characters with respect to the rest by holding a reflecting block on the reverse surface of the screen having dimensions and disposed to register with a selected character or characters.
Claim 3
Independent Claim
92 words
An apparatus for visual instruction comprising: a substantially planar translucent screen having an observation surface and a reverse surface; a writing instrument for depositing an erasable writing medium on one surface of the screen to form alphanumeric characters; means for illuminating the observation surface of the screen; and a series of reflecting blocks of dimensions corresponding to predetermined characters and groups of characters, such blocks being adapted to be held on the reverse surface of said screen in registration with a selected character or characters to enhance the visibility of such characters.
Claim 4
Independent Claim
92 words
An apparatus for visual instruction comprising: a substantially planar translucent screen having an observation surface and a reverse surface; a writing instrument for depositing an erasable writing medium on one surface of the screen to form alphanumeric characters; means for illuminating the observation surface of the screen; and a series of reflecting blocks of dimensions corresponding to predetermined characters and groups of characters, such blocks being adapted to be held on the reverse surface of said screen in registration with a selected character or characters to enhance the visibility of such characters.
Claim 5
Dependent Claim
20 words
An apparatus for visual instruction in accordance with claim 2 in which said reflecting blocks are of white foamed plastic.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |