Patent US4994974A successfully refreshed from Google Patents.
US4994974A
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Touch sensitive navigation system
Assignee: Individual
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Filing: 1988-11-14
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Granted: 1991-02-19
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Expires: 2008-11-14
Abstract
Abstract An improved navigation system for a vehicle. The system includes a microprocessor and memory therefor and permits the pilot of an aircraft or other vehicle to display on a screen a navigation chart showing the position of the vehicle with respect to fixed environmental checkpoints. A compact laser disk comprises the memory. Environmental checkpoints and other navigation data displayed on the screen are stored on the compact disk. The system includes a procedure for inexpensively and quickly updating system memory. The system supersedes navigation chart manuals now utilized by pilots.
Inventors
- 👤 Elihu C. Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:06
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20; G01C21/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A navigation system for a vehicle, including (a) a display screen; (b) read-write memory means for storing navigation chart information for a selected geographical area, including fixed environmental checkpoints in said area; (c) sensor means for detecting the touching of a fingertip to said display screen to generate signals representing certain environmental checkpoints and other chart information contained in said memory means for a portion of said selected geographical area; (d) means in communication with said sensor means to recall from said memory means said chart information for said portion of said selected geographical area; and, (e) means in communication with said recall means for generating signals corresponding to said chart information in said portion of said selected geographical area to display said information on said screen.
Claim 2
Dependent Claim
127 words
A navigation system for a vehicle, including (a) a display screen; (b) read-write memory means for storing navigation chart information for a selected geographical area, including fixed environmental checkpoints in said area; (c) sensor means for detecting the touching of a fingertip to said display screen to generate signals representing certain environmental checkpoints and other chart information contained in said memory means for a portion of said selected geographical area; (d) means in communication with said sensor means to recall from said memory means said chart information for said portion of said selected geographical area; and, (e) means in communication with said recall means for generating signals corresponding to said chart information in said portion of said selected geographical area to display said information on said screen.
References Cited (Backward Citations)
US4156912A
Cited
US4360876A
Cited
US4545023A
Cited
US4642775A
Cited
US4731769A
Cited
US4796190A
Cited
US4827419A
Cited
US4831538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |