US3897267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cells
Assignee: National Research Development Corp UK
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Filing: 1970-10-19
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Granted: 1975-07-29
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Expires: 1990-10-19
Abstract
Abstract A galvanic cell is described which is capable of implantation in living tissue. The cell is essentially a metal/oxygen cell and is covered with or encapsulated in a layer of material in the form of an oxygen permeable membrane, the anode and cathode components being separated by a barrier which is relatively impermeable to oxygen and not permeable to larger molecules, such as oxides of the metal, while allowing hydroxyl ions to diffuse through it.
Inventors
- 👤 Alfred Chan Chung Tseung
- 👤 Beatrice Yuck Chaan Wan
- 👤 Walter John King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:44
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
GALVANIC, METAL/OXYGEN CELL COMPRISING ANODE AND CATHODE COMPONENTS, BARRIER MEANS BETWEEN SAID COMPONENTS, SAID BARIER MEANS CONSISTING OF MATERIAL WHICH IS RELATIVEY IMPERMEABLE TO OXYGEN AND TO LARGER MOLECULES WHILE PERMITTING DIFFUSION OF HYDROXYL IONS THERETHROUGH, AN ELECTROLYTE AND A SURROUNDING ENVELOPE OF OXYGEN PERMEABLE MATERIAL.
Claim 2
Dependent Claim
46 words
GALVANIC, METAL/OXYGEN CELL COMPRISING ANODE AND CATHODE COMPONENTS, BARRIER MEANS BETWEEN SAID COMPONENTS, SAID BARIER MEANS CONSISTING OF MATERIAL WHICH IS RELATIVEY IMPERMEABLE TO OXYGEN AND TO LARGER MOLECULES WHILE PERMITTING DIFFUSION OF HYDROXYL IONS THERETHROUGH, AN ELECTROLYTE AND A SURROUNDING ENVELOPE OF OXYGEN PERMEABLE MATERIAL.
Claim 3
Dependent Claim
17 words
A galvanic cell as claimed in claim 1, wherein said barrier means is an anionic exchange resin.
Claim 4
Dependent Claim
19 words
A galvanic cell as claimed in claim 1, wherein said oxygen permeable material is a membrane of silicone rubber.
Claim 5
Dependent Claim
16 words
A galvanic cell as claimed in claim 1, wherein said electrolyte is isotonic with body fluids.
Claim 6
Dependent Claim
22 words
A galvanic cell as claimed in claim 4, wherein said electrolyte is An aqueous solution containing substantially 0.9 (weight) % sodium chloride.
Claim 7
Dependent Claim
82 words
A galvanic cell of the oxygen depolarised type comprising anode and cathode components of flat sheet form, a barrier of anion exchange resin substantially surrounding said anode component, an electrolyte in which said anode and cathode components are immersed, a liquid impermeable envelope composed of oxygen permeable material in the form of a membrane encapsulating said anode component, cathode component, barrier and electrolyte, and electrical leads from said anode component and said cathode component that pass through said envelope in fluid-tight manner.
Claim 8
Dependent Claim
82 words
A galvanic cell of the oxygen depolarised type comprising anode and cathode components of flat sheet form, a barrier of anion exchange resin substantially surrounding said anode component, an electrolyte in which said anode and cathode components are immersed, a liquid impermeable envelope composed of oxygen permeable material in the form of a membrane encapsulating said anode component, cathode component, barrier and electrolyte, and electrical leads from said anode component and said cathode component that pass through said envelope in fluid-tight manner.
Claim 9
Dependent Claim
38 words
A galvanic cell as claimed in claim 6 wherein said anode component is a disc of high purity metal, said cathode component comprises catalytic particles in a sintered polytetrafluoroethylene binder and said electrolyte is a sodium chloride solution.
Claim 10
Dependent Claim
34 words
A galvanic cell as claimed in claim 7 for in vivo implantation wherein said envelope consists of a thin silicone rubber membrane and said electrolyte is a substantially 0.9% by weight sodium chloride solution.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |