US4891760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-board navigation system for motor vehicles
Assignee: Pioneer Corp
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Filing: 1988-09-23
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Granted: 1990-01-02
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Expires: 2008-09-23
Abstract
Abstract An on-board navigation system for motor vehicles comprises a first storage medium in which map data in digital form is stored, a control device for gathering map data of a region having a given area including a present location of the vehicle from a first storage medium, and to display a map on a display screen on the basis of the gathered map data, and a second storage medium of non-volatile type into and from which data is written and read-out. The control device is operative to memorize, at the time of the turn-off of a power supply of the vehicle, data gathered immediately before a fall of the power in the second storage medium, and to display the map at the time of a rise-up of the power supply on the basis of the data memorized in the second storage medium.
Inventors
- 👤 Takashi Kashiwazaki
- 👤 Hitoshi Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:47
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G09; G09B; G09B29/00; G09B29/10; G09B29/106
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
An on-board navigation system for a motor vehicle, said on-board navigation system comprising: first memory means for storing map data in digital form; control means for gathering map data of a region having a given area including a present location of the vehicle from said first memory means, and to display a map on a display screen on the basis of the gathered map data; and second memory means of a non-volatile type into and from which said map data is written and read-out, wherein said second memory means is operated by said control means to memorize, at the time of a turn-off of a power supply of the vehicle, said map data gathered immediately before a fall of the power supply of the vehicle , and said display screen displays the map at the time of a return of the power supply on the basis of the map data memorized in the second memory means.
Claim 2
Dependent Claim
156 words
An on-board navigation system for a motor vehicle, said on-board navigation system comprising: first memory means for storing map data in digital form; control means for gathering map data of a region having a given area including a present location of the vehicle from said first memory means, and to display a map on a display screen on the basis of the gathered map data; and second memory means of a non-volatile type into and from which said map data is written and read-out, wherein said second memory means is operated by said control means to memorize, at the time of a turn-off of a power supply of the vehicle, said map data gathered immediately before a fall of the power supply of the vehicle , and said display screen displays the map at the time of a return of the power supply on the basis of the map data memorized in the second memory means.
Claim 3
Dependent Claim
179 words
An on-board navigation system for a motor vehicle, said on-board navigation system comprising: first memory means for storing map data in digital form; control means for performing a control operation to read-out map data of a region having a given area including a present location of the vehicle from the first memory means; a semiconductor memory for memorizing the map data read-out from the first memory means as image data; display means for displaying a map on a display screen on the basis of the image data memorized in the semiconductor memory; and second memory means of a non-volatile type into and from which map data is written and read-out, wherein said second memory means is operated by said control means to memorize, at the time of turn-off of a power supply of the vehicle, said image data at a time immediately before a fall of the power supply, and said display means displays the map at the time of a return of the power supply on the basis of the image data memorized in the second memory means.
Claim 4
Dependent Claim
179 words
An on-board navigation system for a motor vehicle, said on-board navigation system comprising: first memory means for storing map data in digital form; control means for performing a control operation to read-out map data of a region having a given area including a present location of the vehicle from the first memory means; a semiconductor memory for memorizing the map data read-out from the first memory means as image data; display means for displaying a map on a display screen on the basis of the image data memorized in the semiconductor memory; and second memory means of a non-volatile type into and from which map data is written and read-out, wherein said second memory means is operated by said control means to memorize, at the time of turn-off of a power supply of the vehicle, said image data at a time immediately before a fall of the power supply, and said display means displays the map at the time of a return of the power supply on the basis of the image data memorized in the second memory means.
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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) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |