US4033679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gonioscope
Assignee: Individual
•
Filing: 1975-12-10
•
Granted: 1977-07-05
•
Expires: 1995-12-10
Abstract
Abstract A gonioscope for viewing the angle of the trabeculum and the drainage angle and related structures comprising a lens having a cylindrical surface and formed at its front end with four inclined facets narrowing toward the front free end thereof. The lens includes a front surface substantially perpendicular to the longitudinal axis of the cylinder having therein a concave inwardly directed recess, the said facets constituting total internal reflection surfaces.
Inventors
- 👤 Walter Sussman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:24
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/117
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A gonioscope for viewing the angle of the trabeculum of the drainage angle comprising: a lens having a cylindrical surface and being formed at its front end with four inclined facets narrowing toward the front free end thereof, said facets being inclined substantially between 20° and 45° relative to said longitudinal axis, and having a front surface substantially perpendicular to the longitudinal axis of said cylindrical surface having therein a concave inwardly directed recess, said facets constituting total internal reflection surfaces.
Claim 2
Dependent Claim
81 words
A gonioscope for viewing the angle of the trabeculum of the drainage angle comprising: a lens having a cylindrical surface and being formed at its front end with four inclined facets narrowing toward the front free end thereof, said facets being inclined substantially between 20° and 45° relative to said longitudinal axis, and having a front surface substantially perpendicular to the longitudinal axis of said cylindrical surface having therein a concave inwardly directed recess, said facets constituting total internal reflection surfaces.
Claim 3
Dependent Claim
23 words
The gonioscope as recited in claim 1, wherein: said facets are coated with a mirror-type coating substance to aid the total internal reflection.
Claim 4
Dependent Claim
25 words
The gonioscope as recited in claim 2 wherein: said facets are substantially symmetric in size and position to one another relative to said cylindrical surface.
Claim 5
Dependent Claim
45 words
The gonioscope as recited in claim 3 wherein: said facets have front edges which are all aligned substantially in a plane perpendicular to said longitudinal axis of the unit; and said concave recess has front edges substantially tangential to the front edges of said facets.
Claim 6
Dependent Claim
19 words
The gonioscope as recited in claim 2 wherein said cylindrical surface is also coated with a mirror type coating.
Claim 7
Dependent Claim
73 words
A gonioscope for viewing the angle of the trabeculum of the drainage angle comprising: a lens having a cylindrical surface and being formed at its front end with four inclined facets in the external surface of said lens toward the front free end thereof, and having a front surface substantially perpendicular to the longitudinal axis of said cylindrical surface having therein a concave inwardly directed recess, said facets constituting total internal reflection surfaces.
Claim 8
Dependent Claim
73 words
A gonioscope for viewing the angle of the trabeculum of the drainage angle comprising: a lens having a cylindrical surface and being formed at its front end with four inclined facets in the external surface of said lens toward the front free end thereof, and having a front surface substantially perpendicular to the longitudinal axis of said cylindrical surface having therein a concave inwardly directed recess, said facets constituting total internal reflection surfaces.
Claim 9
Dependent Claim
23 words
The gonioscope as recited in claim 6 wherein said facets are inclined substantially between 20° and 40 degrees relative to said longitudinal axis.
Claim 10
Dependent Claim
41 words
The gonioscope as recited in claim 6 wherein: said facets are substantially symmetric in size and position to one another relative to said cylindrical surface, said facets being in substantially 90° sections thereof and intersecting each other at substantially 90° angles.
Claim 11
Dependent Claim
26 words
The gonioscope as recited in claim 8, wherein: said facets and said cylindrical surface are coated with a mirror-type coating substance to said total internal reflection.
Claim 12
Dependent Claim
40 words
The gonioscope as recited in claim 6 wherein: said facets have front edges which are all aligned substantially in a plane perpendicular to said longitudinal axis of the unit, and said front edges being tangential to said internal reflecting surfaces.
References Cited (Backward Citations)
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US3413067A
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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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |