US4390972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refreshing system for dynamic memory
Assignee: Canon Inc
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Filing: 1980-11-24
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Granted: 1983-06-28
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Expires: 2000-11-24
Abstract
Abstract An oscillator of a pulse generator for use in a system for refreshing a dynamic memory comprises an operational amplifier having first and second input terminals and an output terminal, a thermistor connected between the first input terminal and the output terminal, a capacitor connected between the first input terminal and a ground, and four resistors. A first resistor is connected between the second input terminal and the output terminal. A second resistor is connected between the second input terminal and the ground. A third resistor is connected between the second input terminal and a power supply. A fourth resistor is connected between the output terminal and power supply.
Inventors
- 👤 Minoru Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:05
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/401; G11C11/406
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
An oscillator of a pulse generator for use in a system for refreshing a dynamic memory comprising: an operational amplifier having a first input terminal and a second input terminal and an output terminal; a thermistor connected between the first input terminal and the output terminal; a capacitor connected between the first input terminal and a ground; a first resistor connected between the second input terminal and the output terminal; a second resistor connected between the second input terminal and the ground; a third resistor connected between the second input terminal and a power supply; and a fourth resistor connected between the output terminal and the power supply.
Claim 2
Dependent Claim
108 words
An oscillator of a pulse generator for use in a system for refreshing a dynamic memory comprising: an operational amplifier having a first input terminal and a second input terminal and an output terminal; a thermistor connected between the first input terminal and the output terminal; a capacitor connected between the first input terminal and a ground; a first resistor connected between the second input terminal and the output terminal; a second resistor connected between the second input terminal and the ground; a third resistor connected between the second input terminal and a power supply; and a fourth resistor connected between the output terminal and the power supply.
Claim 3
Dependent Claim
16 words
A pulse generator according to claim 1, wherein said dynamic memory comprises a random access memory.
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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |