Patent US4523818A successfully refreshed from Google Patents.
US4523818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ocular eyecups for wearers of glasses
Assignee: Carl Zeiss AG
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Filing: 1983-06-09
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Granted: 1985-06-18
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Expires: 2003-06-09
Abstract
Abstract For non-fatiguing observation through microscope eyepieces, the invention contemplates continuously displaceable eyecups for adjustment of pupil coincidence. The simple mechanical structure is based on force-fitted connection of one part of the eyecup to the eyepiece housing, together with guidance of another part parallel to the optical axis.
Inventors
- 👤 Walter H. Lang
- 👤 Joachim Hornschu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:26
CPC Classifications
G; G02; G02B; G02B25/00; G02B25/001
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
An eyecup for adjustment of pupil coincidence for an ocular of an optical viewing instrument, characterized by the fact that a rigid tubular eyecup (2) is adapted for sliding engagement to the housing (1) of the ocular, a snap-ring friction element (5) recessed in said housing for retaining a selected position of continuous axial adjustment, the eyecup (2) having a longitudinal slot (4) for keyed reception of at least one guide part (3) carried by the ocular housing (1).
Claim 2
Dependent Claim
79 words
An eyecup for adjustment of pupil coincidence for an ocular of an optical viewing instrument, characterized by the fact that a rigid tubular eyecup (2) is adapted for sliding engagement to the housing (1) of the ocular, a snap-ring friction element (5) recessed in said housing for retaining a selected position of continuous axial adjustment, the eyecup (2) having a longitudinal slot (4) for keyed reception of at least one guide part (3) carried by the ocular housing (1).
Claim 3
Dependent Claim
26 words
An eyecup according to claim 1, wherein the snap-ring element engages a depression in the eyecup when in an extended position with respect to the housing.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |