US4134647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact lens for examining the interior of the eye
Assignee: Individual
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Filing: 1977-03-22
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Granted: 1979-01-16
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Expires: 1997-03-22
Abstract
Abstract The inner walls of the eye, i.e., the fundus, are examined in panorama with an optical lens comprising a truncate paraboloidal mirror and a corneal contact objective lens. While held in contact with the cornea, the fundus is observed by projecting a light beam into the eye through the lens and viewing the interior eye with a microscope, e.g., a standard slit lamp instrument.
Inventors
- 👤 Arturo J. Ramos-Caldera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:12
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/0008; A61B3/10; A61B3/12; A61B3/125; G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A contact lens for observing the fundus of the eye comprising a truncate paraboloidal mirror and a transparent objective surface shaped for close contact with the cornea of the eye, and wherein said objective surface defines the truncate end of said paraboloidal mirror.
Claim 2
Dependent Claim
43 words
A contact lens for observing the fundus of the eye comprising a truncate paraboloidal mirror and a transparent objective surface shaped for close contact with the cornea of the eye, and wherein said objective surface defines the truncate end of said paraboloidal mirror.
Claim 3
Dependent Claim
19 words
The contact lens of claim 1 wherein said paraboloidal mirror comprises the lateral surface of a truncate paraboloidal lens.
Claim 4
Dependent Claim
60 words
A contact lens for observing the fundus of the eye comprising a generally conical housing, a truncate paraboloidal lens enclosed within said housing, an inwardly reflecting mirror on the lateral surfaces of said paraboloidal lens, a concave cornea shaped objective surface comprising the truncate end of said paraboloidal lens, and means for rigidly retaining said paraboloidal lens in said housing.
Claim 5
Dependent Claim
60 words
A contact lens for observing the fundus of the eye comprising a generally conical housing, a truncate paraboloidal lens enclosed within said housing, an inwardly reflecting mirror on the lateral surfaces of said paraboloidal lens, a concave cornea shaped objective surface comprising the truncate end of said paraboloidal lens, and means for rigidly retaining said paraboloidal lens in said housing.
Claim 6
Independent Claim
66 words
A method for examining the fundus of the eye comprising contacting the cornea of the eye with a truncate paraboloidal lens having an inwardly reflecting mirrored lateral surface, and wherein the truncate portion of said lens is maintained in proximity to said cornea, directing a light beam into the eye and observing the fundus by viewing the reflection thereof in selected areas of said mirrored surface.
Claim 7
Independent Claim
66 words
A method for examining the fundus of the eye comprising contacting the cornea of the eye with a truncate paraboloidal lens having an inwardly reflecting mirrored lateral surface, and wherein the truncate portion of said lens is maintained in proximity to said cornea, directing a light beam into the eye and observing the fundus by viewing the reflection thereof in selected areas of said mirrored surface.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein the fundus reflection is viewed with a microscope.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |