Patent US3397359A successfully refreshed from Google Patents.
US3397359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the input characteristics of four-terminal networks including a programming means
Assignee: Rohde and Schwarz GmbH and Co KG
•
Filing: 1965-02-01
•
Granted: 1968-08-13
•
Expires: 1985-02-01
Abstract
No abstract record available.
Inventors
- 👤 Rohde Lothar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:40
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/28; G01R27/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
IN COMBINATION WITH AN APPARATUS FOR TESTING A FOUR TERMINAL NETWORK INCLUDING A FIRST AND SECOND DECADE TUNABLE FREQUENCY GENERATOR FOR PRODUCING A FIRST AND SECOND OUTPUT FREQUENCY DISPLACED WITH RESPECT FROM ONE ANOTHER BY A PREDETERMINED FIXED DIFFERENCE FREQUENCY, SAID FIRST FREQUENCY BEING FED INTO THE NETWORK UNDER TEST, A FREQUENCY CONVERTER CONNECTED TO THE OUTPUT OF THE NETWORK AND THE SECOND GENERATOR FOR PRODUCING A DIFFERENCE FREQUENCY FROM THE DIFFERENCE BETWEEN THE SECOND FREQUENCY AND THE OUTPUT FREQUENCY OF THE NETWORK, AND AMPLIFIER CONNECTED TO THE CONVERTER AND SELECTIVELY TUNED TO THE DIFFERENCE FREQUENCY TO AMPLIFY THE DIFFERENCE FREQUENCY, AND AN INDICATING DEVICE CONNECTED TO THE OUTPUT OF THE AMPLIFIER TO INDICATE THE MAGNITUDE OF THE AMPLIFIED SIGNAL, THE IMPROVEMENT OF WHICH COMPRISES: PROGRAMMING MEANS FOR STORING A PREDETERMINED PROGRAM HAVING A PLURALITY OF POINTS INDICATIVE OF THE CHARACTERISTICS OF THE NETWORK, AND A MEANS CONNECTED TO THE GENERATORS FOR AUTOMATICALLY ADJUSTING THE FREQUENCIES OF THE OUTPUTS OF THE FIRST AND SECOND GENERATORS IN RESPONSE TO SAID PREDETERMINED PROGRAM.
Claim 2
Dependent Claim
171 words
IN COMBINATION WITH AN APPARATUS FOR TESTING A FOUR TERMINAL NETWORK INCLUDING A FIRST AND SECOND DECADE TUNABLE FREQUENCY GENERATOR FOR PRODUCING A FIRST AND SECOND OUTPUT FREQUENCY DISPLACED WITH RESPECT FROM ONE ANOTHER BY A PREDETERMINED FIXED DIFFERENCE FREQUENCY, SAID FIRST FREQUENCY BEING FED INTO THE NETWORK UNDER TEST, A FREQUENCY CONVERTER CONNECTED TO THE OUTPUT OF THE NETWORK AND THE SECOND GENERATOR FOR PRODUCING A DIFFERENCE FREQUENCY FROM THE DIFFERENCE BETWEEN THE SECOND FREQUENCY AND THE OUTPUT FREQUENCY OF THE NETWORK, AND AMPLIFIER CONNECTED TO THE CONVERTER AND SELECTIVELY TUNED TO THE DIFFERENCE FREQUENCY TO AMPLIFY THE DIFFERENCE FREQUENCY, AND AN INDICATING DEVICE CONNECTED TO THE OUTPUT OF THE AMPLIFIER TO INDICATE THE MAGNITUDE OF THE AMPLIFIED SIGNAL, THE IMPROVEMENT OF WHICH COMPRISES: PROGRAMMING MEANS FOR STORING A PREDETERMINED PROGRAM HAVING A PLURALITY OF POINTS INDICATIVE OF THE CHARACTERISTICS OF THE NETWORK, AND A MEANS CONNECTED TO THE GENERATORS FOR AUTOMATICALLY ADJUSTING THE FREQUENCIES OF THE OUTPUTS OF THE FIRST AND SECOND GENERATORS IN RESPONSE TO SAID PREDETERMINED PROGRAM.
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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |