US3816768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory protecting circuit
Assignee: Honeywell Inc
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Filing: 1972-08-16
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Granted: 1974-06-11
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Expires: 1992-08-16
Abstract
Abstract A circuit for automatically connecting a temporary source of power to a memory system during failure of a primary power source for the memory system to provide low duty cycle current pulses to the memory system.
Inventors
- 👤 J Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:40
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/14; G11C5/141; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; G06F11/2015; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/401; G11C11/402; G11C11/4023; G11C11/4063; G11C11/407; G11C11/4074; G11C11/41; G11C11/413; G11C11/417; H; H03; H03K; H03K17/00; H03K17/22; H03K17/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A circuit comprising: first means for supplying electrical power having a predetermined amplitude and duration, said means including a first direct current power supply means, a switch means and cyclic switch operating means for operating said switch means at a predetermined frequency, a pair of output terminals, first diode means, circuit means connecting said first-mentioned means and said diode means in series across said output terminal means to form a circuit for supplying electrical power to said output terminal means, a second direct current power supply means, a second diode means and, second circuit means arranged to connect said second diode means and said second direct current power supply means in series across said output terminals with said second diode means being poled to prevent discharge of said first-mentioned means through said second supply means and said first diode means being poled to prevent discharge of said second supply means through first-mentioned means, said predetermined frequency of said cyclic switch operating means being arranged to provide an intermittent application of direct current power from said first-mentioned means to said output terminals during the duration of a loss of direct current power from said second supply means.
Claim 2
Dependent Claim
196 words
A circuit comprising: first means for supplying electrical power having a predetermined amplitude and duration, said means including a first direct current power supply means, a switch means and cyclic switch operating means for operating said switch means at a predetermined frequency, a pair of output terminals, first diode means, circuit means connecting said first-mentioned means and said diode means in series across said output terminal means to form a circuit for supplying electrical power to said output terminal means, a second direct current power supply means, a second diode means and, second circuit means arranged to connect said second diode means and said second direct current power supply means in series across said output terminals with said second diode means being poled to prevent discharge of said first-mentioned means through said second supply means and said first diode means being poled to prevent discharge of said second supply means through first-mentioned means, said predetermined frequency of said cyclic switch operating means being arranged to provide an intermittent application of direct current power from said first-mentioned means to said output terminals during the duration of a loss of direct current power from said second supply means.
Claim 3
Dependent Claim
19 words
A circuit as set forth in claim 1 wherein said first direct current power supply means is a battery.
Claim 4
Dependent Claim
19 words
A circuit as set forth in claim 1 wherein said second direction current power supply means is a battery.
Claim 5
Dependent Claim
26 words
A circuit as set forth in claim 2 and including a battery recharging circuit connected between said battery and said second direct current power supply means.
Claim 6
Dependent Claim
29 words
A circuit as set forth in claim 4 wherein said recharging circuit includes a diode means poled to prevent discharge of said battery by said second-mentioned power supply means.
Claim 7
Dependent Claim
20 words
A circuit as set forth in claim 2 wherein said second mentioned direct current power supply means is a battery.
References Cited (Backward Citations)
US3249769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |