US3820899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power and surface inspection adaptor plate
Assignee: American Hydrophilics Corp
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Filing: 1972-09-29
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Granted: 1974-06-28
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Expires: 1992-09-29
Abstract
Abstract The embodiment of the invention disclosed herein is directed to a power and surface inspection plate to be adapted to conventional optical measuring instruments such as lensometers, biomicroscopes or the like. The adaptor plate is positioned in the viewing area of the optical measuring instrument and receives a flexible hydrophilic contact lens which is to have the lens power or surface thereof tested or inspected, respectively. An annular embossment is formed on the top side of the inspection plate. The embossment has an arcuately inwardly directed configuration at the upper annular edge thereof conforming substantially to the configuration of the convex surface of a contact lens to be placed thereupon.
Inventors
- 👤 Cormack H Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:21
CPC Classifications
G; G01; G01M; G01M11/00; G01M11/02; G01M11/0207; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
A power and surface inspection plate for adaptably receiving a flexible hydrophilic contact lens, comprising: plate means for positioning in the viewing area of an optical measuring instrument, an annular embossment formed on one side of said plate means upon which the convex surface of a flexible hydrophilic contact lens is placed, said annular embossment having a relatively thin annular wall defining an aperture centrally through said annular embossment, said annular wall forming a ring-like lens engaging surface having substantially at the same radius of curvature as the lens to be placed in contact therewith, and a concave recess formed on the opposite side of said plate means to facilitate positioning and alignment of said plate means on an optical measuring instrument, said annular embossment adapted to be in registry with the optical viewing mechanism of said optical measuring instrument so that the lEns can be viewed through said aperture.
Claim 2
Dependent Claim
150 words
A power and surface inspection plate for adaptably receiving a flexible hydrophilic contact lens, comprising: plate means for positioning in the viewing area of an optical measuring instrument, an annular embossment formed on one side of said plate means upon which the convex surface of a flexible hydrophilic contact lens is placed, said annular embossment having a relatively thin annular wall defining an aperture centrally through said annular embossment, said annular wall forming a ring-like lens engaging surface having substantially at the same radius of curvature as the lens to be placed in contact therewith, and a concave recess formed on the opposite side of said plate means to facilitate positioning and alignment of said plate means on an optical measuring instrument, said annular embossment adapted to be in registry with the optical viewing mechanism of said optical measuring instrument so that the lEns can be viewed through said aperture.
Claim 3
Dependent Claim
82 words
The power and surface inspection plate according to claim 1 wherein said annular embossment is formed of an annular bushing inserted into an aperture formed through said plate means, said annular bushing having a first reduced diameter portion inserted into said aperture, a flange portion immediately adjacent said first reduced diameter portion to form a stop against said plate means, and a second reduced diameter portion extending upwardly from said flange portion for receiving the flexible hydrophilic contact lens to be analyzed.
Claim 4
Dependent Claim
35 words
The power and surface inspection plate according to claim 1 wherein said alignment means formed on said plate means is a concave surface formed in axial alignment with the aperture formed through said plate means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |