US3893073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyless control mechanism
Assignee: Westinghouse Electric Corp
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Filing: 1974-02-06
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Granted: 1975-07-01
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Expires: 1994-02-06
Abstract
Abstract A controlled display device sequentially displays code information which is viewable only to an observer positioned at a critical angle relative to the display device. The observers actuation of a device acknowledging a predetermined sequence of code information results in the generation of a control signal.
Inventors
- 👤 Paul S Angello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07C; G07C9/00; G07C9/00174; G07C9/00658; G07C9/00674; G07C9/00698
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
Apparatus for generating a control signal in response to predetermined input signals, comprising, first means for sequentially displaying information for viewing by an observer, said first means including a display window having a critical viewing angle requiring the observer to assume a specific position relative to the display window in order to view the displayed information, second means including a single actuator means permitting an observer to selectively acknowledge displayed information and produce signals indicative of the acknowledged display information, and third means operatively connected to said second means and responding to said signals to determine if the acknowledged information corresponds to predetermined information, said third means producing a control signal if said acknowledged information corresponds to said predetermined information.
Claim 2
Dependent Claim
120 words
Apparatus for generating a control signal in response to predetermined input signals, comprising, first means for sequentially displaying information for viewing by an observer, said first means including a display window having a critical viewing angle requiring the observer to assume a specific position relative to the display window in order to view the displayed information, second means including a single actuator means permitting an observer to selectively acknowledge displayed information and produce signals indicative of the acknowledged display information, and third means operatively connected to said second means and responding to said signals to determine if the acknowledged information corresponds to predetermined information, said third means producing a control signal if said acknowledged information corresponds to said predetermined information.
Claim 3
Dependent Claim
15 words
Apparatus claimed in claim 1 wherein said display window consists of a light control film.
Claim 4
Dependent Claim
23 words
Apparatus claimed in claim 1 wherein said display window includes louvers arranged to establish a critical viewing angle for observing the displayed information.
Claim 5
Dependent Claim
19 words
ApparaTus claimed in claim 1 wherein said third means includes mechanical thumbwheel switch means for changing said predetermined information.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |