Patent US3957358A successfully refreshed from Google Patents.
US3957358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewer for microreproduction on a transparent film
Assignee: BELL & HOWELL COMPANY A CORP OF DELAWARE
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Filing: 1974-11-08
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Granted: 1976-05-18
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Expires: 1994-11-08
Abstract
Abstract A device for viewing microreproductions on a transparent film has a lens and a film supporting means which has a pair of frame members adapted to clamp the film therebetween through magnetic attraction of one of the frame members to the other, either the lens or the film support being slidably movable with respect to the other for focusing purposes.
Inventors
- 👤 Robert G. Holliday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
G; G02; G02B; G02B25/00; G02B25/002; G02B25/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A device for viewing microreproductions on transparent film which comprises a magnifying lens, means for supporting the lens and a means for supporting a microreproduction in association with the lens for magnification thereof, said means for supporting the microreproduction comprising a first frame member having a first opening secured thereto and a separate second frame member having a second opening, said first and second openings being aligned therethrough, one of said frame members being a magnet and the other being attractable by a magnet, whereby a microreproduction disposed between the said frame members is supported thereby across the said first and second openings when the attractable frame member is attracted to the magnet, at least one of said supporting means being slidably movable towards and from the other for focusing purposes.
Claim 2
Independent Claim
131 words
A device for viewing microreproductions on transparent film which comprises a magnifying lens, means for supporting the lens and a means for supporting a microreproduction in association with the lens for magnification thereof, said means for supporting the microreproduction comprising a first frame member having a first opening secured thereto and a separate second frame member having a second opening, said first and second openings being aligned therethrough, one of said frame members being a magnet and the other being attractable by a magnet, whereby a microreproduction disposed between the said frame members is supported thereby across the said first and second openings when the attractable frame member is attracted to the magnet, at least one of said supporting means being slidably movable towards and from the other for focusing purposes.
Claim 3
Dependent Claim
84 words
The device of claim 1 wherein the lens is supported in a cylindrical housing, and the supporting means for the microreproduction is a tube open at both ends and having a bore adapted to form a sliding fit on said housing with one end of the tube about the housing and the other end spaced longitudinally from the lens, one of said frame memers is attached to the tube end spaced from the lens and the other frame member is separate from the tube.
Claim 4
Dependent Claim
32 words
The device of claim 2 wherein said tube has an annular flange extending radially outwardly from the said longitudinally spaced end and one of the frame members is attached to the flange.
Claim 5
Dependent Claim
58 words
The device of claim 1 comprising a base member and wherein the said lens supporting means and the microreproduction supporting means are attached to the base in face to face relationship with the lens aligned with the openings in the said frame members, and at least one of the supporting means is slidably attached to the base member.
Claim 6
Dependent Claim
30 words
The device of claim 4 wherein the said base member has a longitudinal groove therein and one of the said supporting means has a protuberance slidably disposed in the groove.
Claim 7
Dependent Claim
19 words
The device of claim 5 wherein the lens supporting means is fixed against movement relative to the base member.
Claim 8
Dependent Claim
25 words
The device of claim 1 wherein the said separate frame member is secured to a transparent sheet which extends across the opening in the frame.
Claim 9
Dependent Claim
25 words
The device of claim 2 wherein the separate frame member is secured to a transparent sheet which extends across the opening in the frame member.
Claim 10
Dependent Claim
25 words
The device of claim 4 wherein the separate frame member is secured to a transparent sheet which extends across the opening in the frame member.
Claim 11
Dependent Claim
25 words
The device of claim 5 wherein the separate frame member is secured to a transparent sheet which extends the opening in the second frame member.
Claim 12
Dependent Claim
30 words
The device of claim 4 wherein the base member has a cavity therein and one of the said supporting means is attached to a slide member disposed in the cavity.
Claim 13
Dependent Claim
17 words
The device of claim 11 wherein the base member is a housing which is rectangular in cross-section.
References Cited (Backward Citations)
US499380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |