Patent US4488772A successfully refreshed from Google Patents.
US4488772A
Expired / Lapsed
US
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Electro-optic indicating device
Assignee: AG Communication Systems Corp
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Filing: 1982-09-02
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Granted: 1984-12-18
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Expires: 2002-09-02
Abstract
Abstract A display apparatus including a liquid crystal device is disposed to turn on or off in the presence or absence of a control voltage respectively. Information located under the liquid crystal device and normally occulted, becomes visible when the display turns on.
Inventors
- 👤 Thomas Georgopulos
- 👤 Thomas A. Cioper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:22
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/002; H04M9/003; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
An electro-optic indicating device for use in a multi-line telephone instrument for displaying line status information responsive to a control voltage applied to the indicating device when one or more lines are in use; said electro-optic indicating device comprising: a liquid crystal display including a layer of liquid crystal material contained between first and second transparent slides, said first slide including a first electrode and said second slide including a second electrode, said first and second electrodes arranged to receive said control voltage; information display means located under said liquid crystal display comprising an information holder having a plurality of walls extending from a face thereof, said walls forming a plurality of information receiving areas arranged to receive a plurality of information strips having information to be displayed printed thereon, said information display means normally occulted; and switching means for applying said control voltage to said first and second electrodes changing the optical property of said liquid crystal material rendering said information display visible.
Claim 2
Dependent Claim
164 words
An electro-optic indicating device for use in a multi-line telephone instrument for displaying line status information responsive to a control voltage applied to the indicating device when one or more lines are in use; said electro-optic indicating device comprising: a liquid crystal display including a layer of liquid crystal material contained between first and second transparent slides, said first slide including a first electrode and said second slide including a second electrode, said first and second electrodes arranged to receive said control voltage; information display means located under said liquid crystal display comprising an information holder having a plurality of walls extending from a face thereof, said walls forming a plurality of information receiving areas arranged to receive a plurality of information strips having information to be displayed printed thereon, said information display means normally occulted; and switching means for applying said control voltage to said first and second electrodes changing the optical property of said liquid crystal material rendering said information display visible.
Claim 3
Dependent Claim
46 words
The electro-optic indicating device as claimed in claim 1, wherein: said information display means includes an information holder having a plurality of walls extending from a face thereof, said walls forming a plurality of information receiving areas arranged to receive a plurality of information strips therein.
Claim 4
Dependent Claim
23 words
The electro-optic indicating device as claimed in claim 1, wherein: each of said plurality of information strips is composed of an opaque material.
Claim 5
Dependent Claim
83 words
An electro-optic indicating device as claimed in claim 1, wherein there is further included a circuit board including a first set of terminals and a second set of terminals, and said information holder is disposed to mount on said circuit board with an individual one of said first set of electrodes and said second set of electrodes communicating with a different one of said circuit board first set and second set of terminals respectively, connecting said liquid crystal display to said control voltage.
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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |