US4417581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal electrode for electroretinography
Assignee: DAWSON WILLIAM W
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Filing: 1980-10-07
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Granted: 1983-11-29
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Expires: 2000-10-07
Abstract
Abstract Corneal electrode comprising an electrically conductive metal wire conductively attached to a yarn of silver-coated nylon fibers. This electrode is employed to measure the change in an electric potential when the eye is subjected to light.
Inventors
- 👤 William W. Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:48
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B5/279; A61B5/297; A61B2562/00; A61B2562/02; A61B2562/0209; A61B2562/0215
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
Corneal electrode for use in electroretinography comprising a yarn of electrically conductive fibers, means for electrically conductively attaching one end of said yarn to a device for measuring electrical potential, and the other end of said yarn comprising separate independent free ends of said fibers said free ends being unconnected to each other and of such dimension and material to permit contact with a surface film of a cornea without substantial abrasive effect thereon.
Claim 2
Dependent Claim
74 words
Corneal electrode for use in electroretinography comprising a yarn of electrically conductive fibers, means for electrically conductively attaching one end of said yarn to a device for measuring electrical potential, and the other end of said yarn comprising separate independent free ends of said fibers said free ends being unconnected to each other and of such dimension and material to permit contact with a surface film of a cornea without substantial abrasive effect thereon.
Claim 3
Dependent Claim
15 words
The electrode of claim 1 in which the electrically conductive fibers are silver-coated nylon fibers.
Claim 4
Dependent Claim
13 words
The electrode of claim 2 in which the yarn comprises 3-6 individual fibers.
Claim 5
Dependent Claim
16 words
The electrode of claim 2 in which each nylon fiber is about 10-15 microns in diameter.
Claim 6
Dependent Claim
31 words
The electrode of claim 1 in which said means for electrically conductively attaching is an electrically conductive metal wire which in turn is attachable to a device for measuring electrical potential.
Claim 7
Dependent Claim
62 words
A process for measuring electrical potentials produced in the eye which comprises contacting the surface film of the cornea with a yarn having substantially no abrasive effect on the eye and consisting essentially of electrically conductive fibers and measuring the electrical potential in the eye by means of an electrical potential measuring device conductively attached to said yarn through an electrical conductor.
Claim 8
Dependent Claim
62 words
A process for measuring electrical potentials produced in the eye which comprises contacting the surface film of the cornea with a yarn having substantially no abrasive effect on the eye and consisting essentially of electrically conductive fibers and measuring the electrical potential in the eye by means of an electrical potential measuring device conductively attached to said yarn through an electrical conductor.
Claim 9
Dependent Claim
12 words
The process of claim 6 wherein said fibers are silver-coated nylon fibers.
Claim 10
Dependent Claim
12 words
The process of claim 7 wherein said yarn comprises 3-6 individual fibers.
Claim 11
Dependent Claim
15 words
The process of claim 7 wherein each individual fiber is about 10-15 microns in diameter.
Claim 12
Dependent Claim
19 words
The process of claim 6 wherein said electrical conductor is attached to said yarn by electrically conductive epoxy cement.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |