US5309031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery replacement system for battery-powered digital data handling devices
Assignee: Dell USA LP
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Filing: 1991-04-22
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Granted: 1994-05-03
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Expires: 2011-04-22
Abstract
Abstract A battery-powered lap-top computer has a main battery for ordinarily supplying power to the computer circuitry. A reserve battery is connected through a manual switch to the circuitry. When the main battery starts to lose its charge, the manual switch is operated to connect the reserve battery to the circuitry prior to removal of the main battery. A new main battery is installed and the switch is operated to disconnect the reserve battery from the circuitry. Provision is made for the main battery to slowly charge the reserve battery.
Inventors
- 👤 Gregory N. Stewart
- 👤 John P. Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:37
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/16; G06F1/1613; G06F1/1633; G06F1/1635; G06F1/26; H; H01; H01M; H01M50/00; H01M50/20; H01M50/247; H01M50/296; H01M50/204; H01M50/207; H01M50/213; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A battery-powered digital data handling device comprising: (a) a main battery for supplying power to the device circuitry; (b) a reserve battery for selectively supplying power to the device circuitry; (c) a switch, connected to the device circuitry for switching to the reserve battery prior to removal of the main battery, to continuously maintain power to the device circuitry; and (d) a charging circuit connected from the main battery to the reserve battery for maintaining the reserve battery in a charged state.
Claim 2
Dependent Claim
82 words
A battery-powered digital data handling device comprising: (a) a main battery for supplying power to the device circuitry; (b) a reserve battery for selectively supplying power to the device circuitry; (c) a switch, connected to the device circuitry for switching to the reserve battery prior to removal of the main battery, to continuously maintain power to the device circuitry; and (d) a charging circuit connected from the main battery to the reserve battery for maintaining the reserve battery in a charged state.
Claim 3
Independent Claim
72 words
A method of replacing the main battery in a digital data handling device without losing power to the device circuitry, comprising the steps of: (a) charging a reserve battery from the main battery; (b) connecting the reserve battery, through a closed switch, to the device circuitry; (c) removing the main battery; and (d) supplying power from the reserve battery to the device circuitry whereby power is continuously maintained to the device circuitry.
Claim 4
Independent Claim
72 words
A method of replacing the main battery in a digital data handling device without losing power to the device circuitry, comprising the steps of: (a) charging a reserve battery from the main battery; (b) connecting the reserve battery, through a closed switch, to the device circuitry; (c) removing the main battery; and (d) supplying power from the reserve battery to the device circuitry whereby power is continuously maintained to the device circuitry.
Claim 5
Dependent Claim
30 words
The method of claim 2 further comprising the steps of: (e) installing the main battery; and (f) opening the closed switch to disconnect the reserve battery from the device circuitry.
Claim 6
Dependent Claim
84 words
A battery replacement system for continuously maintaining power to an electrical load comprising: (a) a main battery for supplying power to the load; (b) a reserve battery for selectively supplying power to the load; (c) a switch, connected to the load for switching to the reserve battery prior to removal of the main battery, to continuously maintain power to the load; and (d) a charging circuit connected from the main battery to the reserve battery for maintaining the reserve battery in a charged state.
Claim 7
Dependent Claim
84 words
A battery replacement system for continuously maintaining power to an electrical load comprising: (a) a main battery for supplying power to the load; (b) a reserve battery for selectively supplying power to the load; (c) a switch, connected to the load for switching to the reserve battery prior to removal of the main battery, to continuously maintain power to the load; and (d) a charging circuit connected from the main battery to the reserve battery for maintaining the reserve battery in a charged state.
Claim 8
Independent Claim
68 words
A method of replacing the main battery in a battery replacement system without losing power to an electrical load, comprising the steps of: (a) charging a reserve battery from the main battery; (b) connecting a reserve battery, through a closed switch, to the load; (c) removing the main battery; and (d) supplying power from the reserve battery to the load whereby power is continuously maintained to the load.
Claim 9
Independent Claim
68 words
A method of replacing the main battery in a battery replacement system without losing power to an electrical load, comprising the steps of: (a) charging a reserve battery from the main battery; (b) connecting a reserve battery, through a closed switch, to the load; (c) removing the main battery; and (d) supplying power from the reserve battery to the load whereby power is continuously maintained to the load.
Claim 10
Dependent Claim
29 words
The method of claim 5 further comprising the steps of: (e) installing the main battery; and (f) opening the closed switch to disconnect the reserve battery from the load.
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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) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |