US3347223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumograph
Assignee: Universal Match Corp
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Filing: 1964-01-08
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Granted: 1967-10-17
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Expires: 1984-01-08
Abstract
No abstract record available.
Inventors
- 👤 Allan F Pacela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:10
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/08; A61B5/085; A61B5/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
AN APPARATUS FOR MEASURING MINUTE CHANGES IN THE ELECTRICAL IMPEDANCE OF THE TISSUE OF A SUBJECT ANIMAL, COMPRISING: A FIRST AND A SECOND PAIR OF ELECTRODES, EACH OF SAID ELECTRODES ADAPTED TO BE IN ELECTRICAL CONTACT WITH THE TISSUE OF THE SUBJECT ANIMAL; AN A.C. CONSTANT CURRENT SOURCE HAVING A PAIR OF OUTPUT TERMINALS, NEITHER OF SAID TERMINALS BEING GROUNDED; SAID SOURCE HAVING AN OUTPUT IMPEDANCE WHICH IS HIGHER AT LOW FREQUENCIES THAN AT HIGH FREQUENCIES; SAID PAIR OF TERMINALS OF SAID SOURCE BEING COUPLED RESPECTIVELY TO SAID FIRST PAIR OF ELECTRODES; A DIFFERENTIAL AMPLIFIER FOR AMPLIFYING A.C. VOLTAGE HAVIING A PAIR OF INPUT TERMINALS, NEITHER OF SAID TERMINALS BEING GROUNDED; SAID AMPLIFIER HAVING AN INPUT IMPEDANCE WHICH IS HIGH COMPARED TO THE IMPEDANCE OF THE TISSUE OF THE SUBJECT ANIMAL; SAID PAIR OF TERMINALS OF SAID AMPLIFIER BEING COUPLED RESPECTIVELY TO SAID SECOND PAIR OF ELECTRODES, AND SAID AMPLIFIER HAVING AN OUTPUT PAIR OF TERMINALS COUPLED TO A MEANS FOR MEASURING THE CHANGES OF THE AMPLIFIER OUTPUT SIGNAL TO OBTAIN A MEASURE OF THE MINUTE CHANGES IN THE ELECTRICAL IMPEDANCE OF THE TISSUE OF THE SUBJECT ANIMAL.
Claim 2
Independent Claim
188 words
AN APPARATUS FOR MEASURING MINUTE CHANGES IN THE ELECTRICAL IMPEDANCE OF THE TISSUE OF A SUBJECT ANIMAL, COMPRISING: A FIRST AND A SECOND PAIR OF ELECTRODES, EACH OF SAID ELECTRODES ADAPTED TO BE IN ELECTRICAL CONTACT WITH THE TISSUE OF THE SUBJECT ANIMAL; AN A.C. CONSTANT CURRENT SOURCE HAVING A PAIR OF OUTPUT TERMINALS, NEITHER OF SAID TERMINALS BEING GROUNDED; SAID SOURCE HAVING AN OUTPUT IMPEDANCE WHICH IS HIGHER AT LOW FREQUENCIES THAN AT HIGH FREQUENCIES; SAID PAIR OF TERMINALS OF SAID SOURCE BEING COUPLED RESPECTIVELY TO SAID FIRST PAIR OF ELECTRODES; A DIFFERENTIAL AMPLIFIER FOR AMPLIFYING A.C. VOLTAGE HAVIING A PAIR OF INPUT TERMINALS, NEITHER OF SAID TERMINALS BEING GROUNDED; SAID AMPLIFIER HAVING AN INPUT IMPEDANCE WHICH IS HIGH COMPARED TO THE IMPEDANCE OF THE TISSUE OF THE SUBJECT ANIMAL; SAID PAIR OF TERMINALS OF SAID AMPLIFIER BEING COUPLED RESPECTIVELY TO SAID SECOND PAIR OF ELECTRODES, AND SAID AMPLIFIER HAVING AN OUTPUT PAIR OF TERMINALS COUPLED TO A MEANS FOR MEASURING THE CHANGES OF THE AMPLIFIER OUTPUT SIGNAL TO OBTAIN A MEASURE OF THE MINUTE CHANGES IN THE ELECTRICAL IMPEDANCE OF THE TISSUE OF THE SUBJECT ANIMAL.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |