US3993048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biomedical electrode
Assignee: Biomedical International Co
•
Filing: 1972-09-08
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Granted: 1976-11-23
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Expires: 1992-09-08
Abstract
Abstract An electrode is provided for medical and biological use. The electrode is a calomel type electrode having a housing, with a mercury-calomel saline solution junction in the housing. A cellophane diaphragm is mounted on the housing to retain the saline solution. However, the diaphragm is sufficiently permeable to allow ionic conduction between a surface of a body being tested and the saline solution.
Inventors
- 👤 Howard T. Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:39
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B2562/00; A61B2562/02; A61B2562/0209; A61B2562/0217
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A biomedical electrode for taking electrical measurements of electrical signals physiologically generated by a subject, comprising, an electrical conductor adapted for connection to an instrument for making electrical measurements, a mercury calomel mixture connected to the electrical conductor, a solution of physiological saline contacting the mercury calomel mixture, and a flexible membrane retaining the solution of physiological saline and being wetted by said solution, said membrane being adapted for direct contact with a surface of the subject to allow ionic conductance through the membrane between the surface and the solution of physiological saline.
Claim 2
Dependent Claim
93 words
A biomedical electrode for taking electrical measurements of electrical signals physiologically generated by a subject, comprising, an electrical conductor adapted for connection to an instrument for making electrical measurements, a mercury calomel mixture connected to the electrical conductor, a solution of physiological saline contacting the mercury calomel mixture, and a flexible membrane retaining the solution of physiological saline and being wetted by said solution, said membrane being adapted for direct contact with a surface of the subject to allow ionic conductance through the membrane between the surface and the solution of physiological saline.
Claim 3
Dependent Claim
28 words
A biomedical electrode for taking electrical measurements of electrical signals physiologically generated by a subject as defined in claim 1 wherein said membrane is a sheet of cellophane.
Claim 4
Dependent Claim
57 words
A biomedical electrode for taking electrical measurements of electrical signals physiologically generated by a subject as defined in claim 1, including a housing holding the mercury calomel mixture and the solution of physiological saline, said membrane being mounted over an opening in one side of the housing to retain the solution of physiological saline in the housing.
Claim 5
Dependent Claim
37 words
A biomedical electrode for taking electrical measurements of electrical signals physiologically generated by a subject as defined in claim 3, including a pocket of air in the housing to allow the membrane to conform to a surface.
Claim 6
Dependent Claim
28 words
A biomedical electrode for taking electrical measurements of electrical signals physiologically generated by a subject as defined in claim 3 wherein the membrane is a sheet of cellophane.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |