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US4426141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright ring keratoscope
Assignee: Individual
•
Filing: 1981-04-23
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Granted: 1984-01-17
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Expires: 2001-04-23
Abstract
Abstract A hand-held keratoscope designed to project a bright circular ring on the cornea having a circular glass ring attached to a handle by a retainer ring with the circular glass ring having a flat polished top surface and a frosted inward sloping bottom surface.
Inventors
- 👤 Harry F. Holcomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:23
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/107
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A device for judging corneal astigmatism comprising a retaining means, a transparent ring held in said retaining means and including a flat polished top surface, inner and outer surfaces depending from opposite edges of said top surface, and a beveled unpolished surface on the opposite surface from said top surface.
Claim 2
Independent Claim
50 words
A device for judging corneal astigmatism comprising a retaining means, a transparent ring held in said retaining means and including a flat polished top surface, inner and outer surfaces depending from opposite edges of said top surface, and a beveled unpolished surface on the opposite surface from said top surface.
Claim 3
Dependent Claim
29 words
The device of claim 1, further characterized by said transparent ring further including a flat polished bottom surface parallel to said top surface and connected to said beveled surface.
Claim 4
Dependent Claim
15 words
The device of claim 1, further characterized by said beveled surface being a frosted surface.
Claim 5
Dependent Claim
15 words
The device of claim 1, further characterized by said inner surface being an unpolished surface.
Claim 6
Dependent Claim
15 words
The device of claim 1, further characterized by said outer surface being an unpolished surface.
Claim 7
Dependent Claim
25 words
The device of claim 1, further characterized by said beveled surface being at an angle of substantially 30 to 50 degrees with said top surface.
Claim 8
Independent Claim
21 words
The device of claims 1, 2, 3, 4, 5 or 6, further characterized by said transparent ring being a glass ring.
Claim 9
Dependent Claim
31 words
The device of claim 1, further characterized by said retaining means including a retainer ring fitted around said outer surface of said transparent ring, and holding means on said retainer ring.
Claim 10
Dependent Claim
19 words
The device of claim 8, further characterized by said holding means being a handle extending from said retainer ring.
Claim 11
Independent Claim
54 words
A device for judging corneal astigmatism in conjunction with a microscope comprising a transparent circular ring and means to hold said circular ring, said ring including a polished top surface, inner and outer surfaces depending from opposite sides of said top surface, and an unpolished surface on the opposite surface from said top surface.
Claim 12
Independent Claim
54 words
A device for judging corneal astigmatism in conjunction with a microscope comprising a transparent circular ring and means to hold said circular ring, said ring including a polished top surface, inner and outer surfaces depending from opposite sides of said top surface, and an unpolished surface on the opposite surface from said top surface.
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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |