US3149627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plethysmograph
Assignee: Individual
•
Filing: 1962-04-25
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Granted: 1964-09-22
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Expires: 1982-04-25
Abstract
No abstract record available.
Inventors
- 👤 Samuel M Bagno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:18
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0295
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
IN PIETHYSMOGRAPH APPARATUS, THE COMBINATION OF TWO CURRENT INPUT ELECTRODES AND TWO VOLTAGE DROP MEASURING ELECTRODES ADAPTED TO BE APPLIED IN PAIRS ACROSS A BODY SEGMENT WITH ONE CURRENT ELECTRODE ADJACENT ONE VOLTAGE ELECTRODE AND THE OTHER CURRENT ELECTRODE ADJACENT THE OTHER VOLTAGE ELECTRODE, AN IMPEDANCE MEASURING BRIDGE HAVING SAID CURRENT ELECTRODES CONNECTED IN ONE ARM THEREOF AND INCLUDING VARIABLE MEANS FOR ADJUSTING THE CURRENT THROUGH AND THE VOLTAGE DROP ACROSS THE BODY SEGMENT SO THAT THE SENSITIVITY OF THE VOLTAGE MEASUREMENT ACROSS THE BODY SECTION IS ALWAYS CONSTANT, A HIGH FREQUENCY OSCILLATOR CONNECTED TO SAID VOLTAGE ELECTRODES AND TO SAID BRIDGE TO FEED SAID BRIDGE WHEREBY THE IMPEDANCE OF THE SEGMENT UNDER TEST CAUSES A VOLTAGE DROP BETWEEN SAID VOLTAGE ELECTRODES TO UNBALANCE SAID BRIDGE, A TRANSISTORIZED PHASE SENSITIVE DETECTOR NETWORK CONNECTED TO SAID BRIDGE FOR MEASURING THE UNBALANCE OF SAID BRIDGE AND HAVING AN OUTPUT OF SAID DETECTOR, A NETWORK FOR AMPLIFYING THE OUTPUT TO PRODUCE A SIGNAL, AND AN INDICATOR RESPONSIVE TO THE BODY SEGMENT UNDER TEST AT ANY SPECIFIC INSTANCE IN VALUES OF VOLUMETRIC BLOOD FLOW.
Claim 2
Dependent Claim
180 words
IN PIETHYSMOGRAPH APPARATUS, THE COMBINATION OF TWO CURRENT INPUT ELECTRODES AND TWO VOLTAGE DROP MEASURING ELECTRODES ADAPTED TO BE APPLIED IN PAIRS ACROSS A BODY SEGMENT WITH ONE CURRENT ELECTRODE ADJACENT ONE VOLTAGE ELECTRODE AND THE OTHER CURRENT ELECTRODE ADJACENT THE OTHER VOLTAGE ELECTRODE, AN IMPEDANCE MEASURING BRIDGE HAVING SAID CURRENT ELECTRODES CONNECTED IN ONE ARM THEREOF AND INCLUDING VARIABLE MEANS FOR ADJUSTING THE CURRENT THROUGH AND THE VOLTAGE DROP ACROSS THE BODY SEGMENT SO THAT THE SENSITIVITY OF THE VOLTAGE MEASUREMENT ACROSS THE BODY SECTION IS ALWAYS CONSTANT, A HIGH FREQUENCY OSCILLATOR CONNECTED TO SAID VOLTAGE ELECTRODES AND TO SAID BRIDGE TO FEED SAID BRIDGE WHEREBY THE IMPEDANCE OF THE SEGMENT UNDER TEST CAUSES A VOLTAGE DROP BETWEEN SAID VOLTAGE ELECTRODES TO UNBALANCE SAID BRIDGE, A TRANSISTORIZED PHASE SENSITIVE DETECTOR NETWORK CONNECTED TO SAID BRIDGE FOR MEASURING THE UNBALANCE OF SAID BRIDGE AND HAVING AN OUTPUT OF SAID DETECTOR, A NETWORK FOR AMPLIFYING THE OUTPUT TO PRODUCE A SIGNAL, AND AN INDICATOR RESPONSIVE TO THE BODY SEGMENT UNDER TEST AT ANY SPECIFIC INSTANCE IN VALUES OF VOLUMETRIC BLOOD FLOW.
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |