US3249879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric impedance waveform generator
Assignee: Specto Ltd
•
Filing: 1963-05-01
•
Granted: 1966-05-03
•
Expires: 1983-05-01
Abstract
No abstract record available.
Inventors
- 👤 Ward John Joseph
- 👤 Mccarthy Brian Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:06
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28; H; H03; H03K; H03K4/00; H03K4/02; H03K4/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A WAVEFORM GENERATOR COMPRISING A PULSE SOURCE INCLUDING A PLURALITY OF OUTPUTS FOR GENERATING A PREDETERMINED SEQUENCE OF PULSES HAVING THE SAME AMPLITUDE, A RESISTOR MATRIX COMPRISING A PLURALITY OF RESISTORS JOINED IN SERIES, AN INPUT DEVICE CONNECTED IN SERIES WITH THE RESISTOR MATRIX, A PLURALITY OF DIODES CONNECTING THE OUTPUTS OF SAID PULSE SOURCE EACH OF A JUNCTION BETWEEN ADJACENT RESISTORS OF SAID MATRIX WHEREBY EACH PULSE OF SAID SEQUENCE IS APPLIED ACROSS RESPECTIVE PRESELECTED RESISTORS OF SAID MATRIX AND SAID OUTPUT DEVICE IN SERIES; SAID OUTPUT DEVICE COMPRISES AN AMPLIFIER DEVICE INCLUDING AN INPUT AND AN OUTPUT, A LOAD RESISTOR CONNECTED IN SERIES BETWEEN THE RESISTOR MATRIX AND THE INPUT OF SAID AMPLIFIER, AND NEGATIVE FEEDBACK MEANS CONNECTED BETWEEN THE OUTPUT AND INPUT OF THE AMPLIFIER DEVICE WHEREBY THE D.C. GAIN OF THE AMPLIFIER DEVICE IS SUBSTANTIALLY UNITY.
Claim 2
Dependent Claim
140 words
A WAVEFORM GENERATOR COMPRISING A PULSE SOURCE INCLUDING A PLURALITY OF OUTPUTS FOR GENERATING A PREDETERMINED SEQUENCE OF PULSES HAVING THE SAME AMPLITUDE, A RESISTOR MATRIX COMPRISING A PLURALITY OF RESISTORS JOINED IN SERIES, AN INPUT DEVICE CONNECTED IN SERIES WITH THE RESISTOR MATRIX, A PLURALITY OF DIODES CONNECTING THE OUTPUTS OF SAID PULSE SOURCE EACH OF A JUNCTION BETWEEN ADJACENT RESISTORS OF SAID MATRIX WHEREBY EACH PULSE OF SAID SEQUENCE IS APPLIED ACROSS RESPECTIVE PRESELECTED RESISTORS OF SAID MATRIX AND SAID OUTPUT DEVICE IN SERIES; SAID OUTPUT DEVICE COMPRISES AN AMPLIFIER DEVICE INCLUDING AN INPUT AND AN OUTPUT, A LOAD RESISTOR CONNECTED IN SERIES BETWEEN THE RESISTOR MATRIX AND THE INPUT OF SAID AMPLIFIER, AND NEGATIVE FEEDBACK MEANS CONNECTED BETWEEN THE OUTPUT AND INPUT OF THE AMPLIFIER DEVICE WHEREBY THE D.C. GAIN OF THE AMPLIFIER DEVICE IS SUBSTANTIALLY UNITY.
References Cited (Backward Citations)
US2472774A
Cited
GB809375A
Cited
US2857462A
Cited
US2963579A
Cited
US2918669A
Cited
US2974285A
Cited
US3135873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |