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US3467837A
Expired / Lapsed
US
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Blood pressure measuring system for separating and separately recording d.c. signal and an a.c. signal
Assignee: National Aeronautics and Space Administration
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Filing: 1966-12-27
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Granted: 1969-09-16
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Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 Howard A Vick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:04
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/02; A61B7/04; A61B7/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A REPROGRAMMING SYSTEM FOR SEPARATING AND SEPARATELY RECORDING AN INPUT SIGNAL HAVING A D.C. COMPONENT AND AN A.C. COMPONENT SUPERIMPOSED THEREON COMPRISING: (A) A FIRST DIFFERENTIAL AMPLIFIER HAVING INPUT TERMINALS AND OUTPUT TERMINALS; (B) MEANS FOR APPLYING SAID INPUT SIGNAL ACROSS THE INPUT TERMINALS OF SAID FIRST DIFFERENTIAL AMPLIFIER; (C) MEANS FOR COUPLING SAID A.C. COMPONENT OF SAID INPUT SIGNAL FROM ONE OF SAID FIRST DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS TO AN A.C. OUTPUT TERMINAL; (D) A SECOND DIFFERENTIAL AMPLIFIER HAVING INPUT TERMINALS AND OUTPUT TERMINALS; (E) MEANS FOR COUPLING SAID D.C. COMPONENT FROM ANOTHER OF SAID FIRST DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS TO SAID SECOND DIFFERENTIAL AMPLIFIER INPUT TERMINALS; (F) AN OSCILLATOR HAVING INPUT MEANS AND OUTPUT MEANS FOR PRODUCING PULSES REPRESENTATIVE OF SAID D.C. COMPONENT AT SAID SECOND DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS; (G) A CHARGING CAPACITOR COUPLED TO SAID SECOND DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS AND ACROSS SAID OSCILLATOR INPUT MEANS; (H) MEANS FOR PRODUCING A SQUARE-WAVE HAVING A FREQUENCY ONE-HALF THE FREQUENCY OF SAID PULSES PRODUCED BY SAID OSCILLATOR AT A D.C. OUTPUT TERMINAL HAVING INPUT MEANS AND OUTPUT MEANS, SAID SQUAREWAVE PRODUCING MEANS INPUT MEANS BEING COUPLED TO SAID OSCILLATOR OUTPUT MEANS.
Claim 2
Dependent Claim
193 words
A REPROGRAMMING SYSTEM FOR SEPARATING AND SEPARATELY RECORDING AN INPUT SIGNAL HAVING A D.C. COMPONENT AND AN A.C. COMPONENT SUPERIMPOSED THEREON COMPRISING: (A) A FIRST DIFFERENTIAL AMPLIFIER HAVING INPUT TERMINALS AND OUTPUT TERMINALS; (B) MEANS FOR APPLYING SAID INPUT SIGNAL ACROSS THE INPUT TERMINALS OF SAID FIRST DIFFERENTIAL AMPLIFIER; (C) MEANS FOR COUPLING SAID A.C. COMPONENT OF SAID INPUT SIGNAL FROM ONE OF SAID FIRST DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS TO AN A.C. OUTPUT TERMINAL; (D) A SECOND DIFFERENTIAL AMPLIFIER HAVING INPUT TERMINALS AND OUTPUT TERMINALS; (E) MEANS FOR COUPLING SAID D.C. COMPONENT FROM ANOTHER OF SAID FIRST DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS TO SAID SECOND DIFFERENTIAL AMPLIFIER INPUT TERMINALS; (F) AN OSCILLATOR HAVING INPUT MEANS AND OUTPUT MEANS FOR PRODUCING PULSES REPRESENTATIVE OF SAID D.C. COMPONENT AT SAID SECOND DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS; (G) A CHARGING CAPACITOR COUPLED TO SAID SECOND DIFFERENTIAL AMPLIFIER OUTPUT TERMINALS AND ACROSS SAID OSCILLATOR INPUT MEANS; (H) MEANS FOR PRODUCING A SQUARE-WAVE HAVING A FREQUENCY ONE-HALF THE FREQUENCY OF SAID PULSES PRODUCED BY SAID OSCILLATOR AT A D.C. OUTPUT TERMINAL HAVING INPUT MEANS AND OUTPUT MEANS, SAID SQUAREWAVE PRODUCING MEANS INPUT MEANS BEING COUPLED TO SAID OSCILLATOR OUTPUT MEANS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |