Patent US3276032A successfully refreshed from Google Patents.
US3276032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillator driving a resonant circuit with a square wave and having negative feedback
Assignee: International Business Machines Corp
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Filing: 1964-09-17
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Granted: 1966-09-27
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Expires: 1984-09-17
Abstract
No abstract record available.
Inventors
- 👤 Ordower Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:05
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1206; H03B5/1221; H03B5/1231; H03B5/1237; H03B5/124; H03B5/1296
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
AN ASTABLE DRIVE CIRCUIT FOR THE MAGNETIC WRITE HEAD OF MAGNETIC CHARACTER READER-SORTER APPARATUS, SAID CIRCUIT COMPRISING A FIRST INVERTING TRANSISTOR AMPLIFER OPERATED CLASS A DURING STABLE OPERATION OF THE DRIVE CIRCUIT AND HAVING A FIRST OUTPUT; A COMMON EMMITER TRANSISTOR AMPLIFIER HAVING A SECOND OUTPUT AND OPERATED BETWEEN CUTOFF AND SATURATION DURING STABLE OPERATION OF THE DRIVE CIRCUIT IN RESPONSE TO SIGNALS AT THE FIRST OUTPUT; MEANS PROVIDING NEGATIVE FEEDBACK BETWEEN THE SECOND OUTPUT AND THE FIRST AMPLIFIER; A THIRD COMMON EMMITER TRANSISTOR AMPLIFIER HAVING AN OUTPUT CIRCUIT CONNECTED TO THE RESONANT CIRCUIT AND OPERATED BETWEEN CUTOFF AND SATURATION DURING STABLE OPERATION OF THE OSCILLATOR IN RESPONSE TO SIGNALS AT THE SECOND OUTPUT; A RESONANT CIRCUIT INCLUDING A FIRST CAPACITOR AND THE PRIMARY WINDING OF A TRANSFORMER CONNECTED IN PARALLEL IN THE OUTPUT CIRCUIT OF THE THIRD AMPLIFIER AND TUNED TO A DESIRED FREQUENCY, AND A SECOND CAPACITOR, THE SECONDARY WINDING OF SAID TRANSFORMER AND SAID WRITE HEAD CONNECTED IN SERIES AND TUNED TO THE DESIRED FREQUENCY; AND MEANS PROVIDING POSITIVE FEEDBACK BETWEEN THE RESONANT CIRCUIT AND THE FIRST AMPLIFIER.
Claim 2
Dependent Claim
181 words
AN ASTABLE DRIVE CIRCUIT FOR THE MAGNETIC WRITE HEAD OF MAGNETIC CHARACTER READER-SORTER APPARATUS, SAID CIRCUIT COMPRISING A FIRST INVERTING TRANSISTOR AMPLIFER OPERATED CLASS A DURING STABLE OPERATION OF THE DRIVE CIRCUIT AND HAVING A FIRST OUTPUT; A COMMON EMMITER TRANSISTOR AMPLIFIER HAVING A SECOND OUTPUT AND OPERATED BETWEEN CUTOFF AND SATURATION DURING STABLE OPERATION OF THE DRIVE CIRCUIT IN RESPONSE TO SIGNALS AT THE FIRST OUTPUT; MEANS PROVIDING NEGATIVE FEEDBACK BETWEEN THE SECOND OUTPUT AND THE FIRST AMPLIFIER; A THIRD COMMON EMMITER TRANSISTOR AMPLIFIER HAVING AN OUTPUT CIRCUIT CONNECTED TO THE RESONANT CIRCUIT AND OPERATED BETWEEN CUTOFF AND SATURATION DURING STABLE OPERATION OF THE OSCILLATOR IN RESPONSE TO SIGNALS AT THE SECOND OUTPUT; A RESONANT CIRCUIT INCLUDING A FIRST CAPACITOR AND THE PRIMARY WINDING OF A TRANSFORMER CONNECTED IN PARALLEL IN THE OUTPUT CIRCUIT OF THE THIRD AMPLIFIER AND TUNED TO A DESIRED FREQUENCY, AND A SECOND CAPACITOR, THE SECONDARY WINDING OF SAID TRANSFORMER AND SAID WRITE HEAD CONNECTED IN SERIES AND TUNED TO THE DESIRED FREQUENCY; AND MEANS PROVIDING POSITIVE FEEDBACK BETWEEN THE RESONANT CIRCUIT AND THE FIRST AMPLIFIER.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |