US4838678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnifying binocular ophthalmoscope
Assignee: Lions Eye Institute
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Filing: 1987-12-08
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Granted: 1989-06-13
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Expires: 2007-12-08
Abstract
Abstract A magnifying binocular opthalmoscope comprising a mirror system and a telescopic lens system. Light travels from the source of an image to the mirror system and is reflected thereby to travel through the telescopic lens system. The telescopic lens system comprises two series of lenses to provide the operator of the magnifying binocular opthalmoscope with binocular vision. The operator is able to view a magnification of the image of the source through the eye pieces of the two series of lenses.
Inventors
- 👤 Maximiliaan J. Hubertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:54
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/13; A61B3/132
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A magnifying binocular ophthalmoscope for use with an ophthalmoscopy lens to magnify an incoming image entering said ophthalmoscope, said ophthalmoscope comprising: a light source housing containing a light source for illuminating the interior of a patient's eye; mirror means and two image reflection means; said mirror means having two mirror units arranged to reflect said incoming image into two paths; each said image reflecting means being arranged to receive and reflect said incoming image from a respective said path; each said image reflecting means reflecting said incoming image through a respective magnifying lens system comprising on objective lens, a Schmidt or Pechan prism and an eye-piece through which an observer views a magnified incoming image, and each magnifying lens system has an optical axis; wherein, each said image reflecting means, objective lens, Schmidt or Pechan prism and eye-piece are linearly aligned whereby each said optical axis is a single non-deviating line extending from a respective said image reflecting means to a respective said eye-piece and whereby the said optical axes are parallel.
Claim 2
Dependent Claim
172 words
A magnifying binocular ophthalmoscope for use with an ophthalmoscopy lens to magnify an incoming image entering said ophthalmoscope, said ophthalmoscope comprising: a light source housing containing a light source for illuminating the interior of a patient's eye; mirror means and two image reflection means; said mirror means having two mirror units arranged to reflect said incoming image into two paths; each said image reflecting means being arranged to receive and reflect said incoming image from a respective said path; each said image reflecting means reflecting said incoming image through a respective magnifying lens system comprising on objective lens, a Schmidt or Pechan prism and an eye-piece through which an observer views a magnified incoming image, and each magnifying lens system has an optical axis; wherein, each said image reflecting means, objective lens, Schmidt or Pechan prism and eye-piece are linearly aligned whereby each said optical axis is a single non-deviating line extending from a respective said image reflecting means to a respective said eye-piece and whereby the said optical axes are parallel.
Claim 3
Dependent Claim
24 words
A magnifying binocular ophthalmoscope in accordance with claim 1, wherein said Schmidt or Pechan prism is located between said objective lens and said eye-piece.
Claim 4
Dependent Claim
20 words
A magnifying binocular ophthalmoscope in accordance with claim 1, wherein said two image reflecting means comprise two further mirror units.
Claim 5
Dependent Claim
64 words
A magnifying binocular ophthalmoscope in accordance with claim 1, wherein said two mirror units of said mirror means are at substantially a right angle to one another and a plano-convex lens is positioned forward of said mirror means such that said incoming image is refracted by said plano-convex lens prior to said incoming image impinging upon said two mirror units of said mirror means.
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |