Patent US3968385A successfully refreshed from Google Patents.
US3968385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state storage drive
Assignee: Digital Equipment Corp
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Filing: 1974-10-31
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Granted: 1976-07-06
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Expires: 1994-10-31
Abstract
Abstract A drive unit, such as a drive unit for a storage device including an integrated solid-state store, including an input terminal, a capacitively loaded output terminal, and a charging transistor which is connected between a supply terminal and the output terminal. The output terminal is connected, by means of a rectifying member, to a discharge switch, the output terminal also being connected, by means of a capacitive member, to a voltage supply circuit which is connected between the supply terminal and a control electrode of the charging resistor.
Inventors
- 👤 Willem Cornelis Van Tol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:17
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/041; H03K17/04113; G; G11; G11C; G11C5/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A drive unit comprising an input terminal; a capacitively loaded output terminal; a charging transistor connected between said supply terminal and said output terminal, said output terminal being connected through a rectifying member to said input terminal; a discharge circuit connected between said rectifying member and said input terminal, comprising a transistor having one electrode connected to said rectifying member, and another electrode connected to ground; said input terminal being connected to the base of said transistor in said discharge circuit by means of a differentiating network comprising a resistor and a capacitor connected in parallel between said input terminal and said base of said transistor in said discharge circuit; said output terminal being connected, through a capacitive member, to a center tapping of a voltage distribution circuit connected between said supply terminal and a control electrode of said charging transistor so that when said charging transistor is conductive, an additional control voltage is applied to said control electrode.
Claim 2
Dependent Claim
159 words
A drive unit comprising an input terminal; a capacitively loaded output terminal; a charging transistor connected between said supply terminal and said output terminal, said output terminal being connected through a rectifying member to said input terminal; a discharge circuit connected between said rectifying member and said input terminal, comprising a transistor having one electrode connected to said rectifying member, and another electrode connected to ground; said input terminal being connected to the base of said transistor in said discharge circuit by means of a differentiating network comprising a resistor and a capacitor connected in parallel between said input terminal and said base of said transistor in said discharge circuit; said output terminal being connected, through a capacitive member, to a center tapping of a voltage distribution circuit connected between said supply terminal and a control electrode of said charging transistor so that when said charging transistor is conductive, an additional control voltage is applied to said control electrode.
Claim 3
Dependent Claim
29 words
A drive unit as defined in claim 1, wherein said discharge circuit comprises a transistor having one electrode connected to said rectifying member, and another electrode connected to ground.
Claim 4
Dependent Claim
30 words
A drive unit as defined in claim 2, wherein said input terminal is connected to the base of said transistor in said discharge circuit by means of a differentiating network.
Claim 5
Dependent Claim
35 words
A drive unit as defined in claim 3, wherein said differentiating network comprises a resistor and a capacitor connected in parallel between said input terminal and said base of said transistor in said discharge circuit.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |