Patent US3948585A successfully refreshed from Google Patents.
US3948585A
Expired / Lapsed
US
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Ophthalmoscope examination pattern having slit and surrounding ring
Assignee: Heine Optotechnik KG
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Filing: 1974-06-20
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Granted: 1976-04-06
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Expires: 1994-06-20
Abstract
Abstract The present application discloses an examination pattern for use in conjunction with ophthalmoscopes which provide a illuminated slit surrounded by an illuminated ring to permit the physician to view the environment of the portion of the retina illuminated by the slit.
Inventors
- 👤 Helmut A. Heine
- 👤 Klaus Heilmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:31
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/12; A61B3/1208
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
An ophthalmoscope comprising means for projecting a beam of light into the eye of a patient and onto the fundus of the eye and shaping means for forming an examination pattern in said beam for projection onto said fundus, said shaping means including a non-light transmissive pattern forming mask having a light transmissive ring portion and a light transmissive slit portion which lies within and is enclosed by said ring portion.
Claim 2
Dependent Claim
71 words
An ophthalmoscope comprising means for projecting a beam of light into the eye of a patient and onto the fundus of the eye and shaping means for forming an examination pattern in said beam for projection onto said fundus, said shaping means including a non-light transmissive pattern forming mask having a light transmissive ring portion and a light transmissive slit portion which lies within and is enclosed by said ring portion.
Claim 3
Dependent Claim
19 words
Apparatus in accordance with claim 1 wherein said slit portion runs through the mid point of said ring portion.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |