US3652169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewer for transparent slides
Assignee: EMD Millipore Corp
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Filing: 1971-04-01
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Granted: 1972-03-28
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Expires: 1991-04-01
Abstract
Abstract A viewer for slides useful in clinical testing. The viewer is particularly useful for viewing precipitates formed in optically transparent or translucent gels contained in transparent trays. It includes a base member having side walls, a cover plate and a mask spaced above the cover plate. The slide is placed between the mask and the upper surface of the cover plate. Means are provided defining an entrance pupil above the mask. The slide is illuminated from a light source within the base. Light passes through a slit in the cover plate from the source to the location in the gel where the precipitate is most likely to be present. The slit is however masked from the view of the user by the mask and entrance pupil. Thus, the precipitate is readily seen if present, since it diffuses the light from source. If it is absent, only a black field of view is seen, since the upper surface of the cover plate is blackened in the viewing area.
Inventors
- 👤 Bernard R Danti
- 👤 Paul E Brefka
- 👤 Wayne S Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:48
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/022; G02B27/024
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
Apparatus for viewing transparent slides in which a precipitate band may be formed in a substantially optically clear material comprising in combination: a. a base member having upstanding side and end walls; b. a cover plate supported on the side and end walls of said base member; c. masking means covering at least a portion of said slide when said slide is in viewing position and exposing a portion thereof for viewing, thereby defining a viewing area; d. means defining an entrance pupil positioned above said masking means and cooperating with said masking means to determine a viewing axis; and e. illuminating means including a light source mounted in said base member below said cover plate, and a slit formed in said cover plate, said slit and the optical center of said light source lying approximately on a straight line and defining an illuminating axis, said illuminating axis intersecting said viewing axis at about the most probable location of the precipitate band; said slit in said cover plate lying outside the viewing area defined by said mask.
Claim 2
Dependent Claim
177 words
Apparatus for viewing transparent slides in which a precipitate band may be formed in a substantially optically clear material comprising in combination: a. a base member having upstanding side and end walls; b. a cover plate supported on the side and end walls of said base member; c. masking means covering at least a portion of said slide when said slide is in viewing position and exposing a portion thereof for viewing, thereby defining a viewing area; d. means defining an entrance pupil positioned above said masking means and cooperating with said masking means to determine a viewing axis; and e. illuminating means including a light source mounted in said base member below said cover plate, and a slit formed in said cover plate, said slit and the optical center of said light source lying approximately on a straight line and defining an illuminating axis, said illuminating axis intersecting said viewing axis at about the most probable location of the precipitate band; said slit in said cover plate lying outside the viewing area defined by said mask.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein said slit is beveled to slope outwardly from the top surface of said cover plate toward the base member walls.
Claim 4
Dependent Claim
22 words
The apparatus of claim 1 wherein the portion of the cover plate in the vicinity of the viewing area is light absorbing.
Claim 5
Dependent Claim
26 words
The apparatus of claim 3 wherein the slit is beveled to slope outwardly from the top surface of said cover plate toward the base member walls.
Claim 6
Dependent Claim
174 words
Apparatus for viewing transparent slides in which a precipitate band may be formed in a substantially optically clear material comprising in combination: a. a base member b. a cover plate supported on said base member; c. a hood member covering at least a portion of said cover plate, said hood member including a masking plate, which plate defines a viewing area, and an entrance pupil formed in said hood member and located above said masking plate and cooperating with said masking plate to determine a viewing axis; d. illuminating means including a light source mounted on said base member below said cover plate, and a slit formed in said cover plate, the center of said slit and the optical center of said light source lying approximately on a straight line and defining an illuminating axis, said illuminating axis intersecting said viewing axis at about the most probable location of the precipitate band when said slide is in viewing position said slit in said cover plate lying outside the viewing area defined by said mask.
Claim 7
Dependent Claim
174 words
Apparatus for viewing transparent slides in which a precipitate band may be formed in a substantially optically clear material comprising in combination: a. a base member b. a cover plate supported on said base member; c. a hood member covering at least a portion of said cover plate, said hood member including a masking plate, which plate defines a viewing area, and an entrance pupil formed in said hood member and located above said masking plate and cooperating with said masking plate to determine a viewing axis; d. illuminating means including a light source mounted on said base member below said cover plate, and a slit formed in said cover plate, the center of said slit and the optical center of said light source lying approximately on a straight line and defining an illuminating axis, said illuminating axis intersecting said viewing axis at about the most probable location of the precipitate band when said slide is in viewing position said slit in said cover plate lying outside the viewing area defined by said mask.
Claim 8
Dependent Claim
161 words
Apparatus for viewing transparent slides in which a precipitate band may be formed in a substantially optically clear material comprising in combination: a. a slide-supporting plate having a slide-supporting surface; b. masking means covering at least a portion of a slide when the slide is in viewing position on said slide-supporting plate and exposing another portion of said slide for viewing, thereby defining a slide viewing area; c. means defining an entrance pupil positioned above said masking means and cooperating with said masking means to determine a viewing axis; and e. illuminating means including a light source, and a slit formed in said slide supporting plate, the center of said slit and the optical center of said light source lying on a straight line and defining an illuminating axis, said illuminating axis intersecting said viewing axis at about the most probable location of the precipitate band; said slit in said slide-supporting plate lying outside the viewing area defined by said mask.
Claim 9
Dependent Claim
161 words
Apparatus for viewing transparent slides in which a precipitate band may be formed in a substantially optically clear material comprising in combination: a. a slide-supporting plate having a slide-supporting surface; b. masking means covering at least a portion of a slide when the slide is in viewing position on said slide-supporting plate and exposing another portion of said slide for viewing, thereby defining a slide viewing area; c. means defining an entrance pupil positioned above said masking means and cooperating with said masking means to determine a viewing axis; and e. illuminating means including a light source, and a slit formed in said slide supporting plate, the center of said slit and the optical center of said light source lying on a straight line and defining an illuminating axis, said illuminating axis intersecting said viewing axis at about the most probable location of the precipitate band; said slit in said slide-supporting plate lying outside the viewing area defined by said mask.
Claim 10
Dependent Claim
25 words
The apparatus of claim 6 wherein a portion of the surface of the slide-supporting plate in the vicinity of the viewing area is light absorbing.
Claim 11
Dependent Claim
24 words
The combination defined in claim 6 in which said viewing axis is substantially normal to the slide supporting surface of the slide supporting plate.
References Cited (Backward Citations)
US2495912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |