US3799664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual focus microfiche assembly and viewer
Assignee: UMF Systems Inc
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Filing: 1972-06-19
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Granted: 1974-03-26
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Expires: 1992-06-19
Abstract
Abstract A dual focus microfiche viewing system wherein spaced microimage bearing surfaces of superimposed microfiches are viewed slectively by focusing on the desired microimage bearing surface. The necessary spacing of the microimage bearing surfaces is maintained by the microfiches themselves. More particularly, the outer surfaces of two adjacent microfiches are the microimage bearing surfaces thereof, whereby the microimage bearing surfaces are spaced apart by the total of the thicknesses of the two microfiches, without any necessity for separate spacers, or the like.
Inventors
- 👤 G Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/115
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A dual focus fiche assembly, including two superimposed transparent fiches each being a single sheet of a single material having an outer surface bearing microimages in perpekdicular arrays and each having an inner surface, said inner surfaces being in mutual surface contact, and the microimages on one of said outer surfaces being reversed when viewed from a location outwardly of such outer surface.
Claim 2
Dependent Claim
63 words
A dual focus fiche assembly, including two superimposed transparent fiches each being a single sheet of a single material having an outer surface bearing microimages in perpekdicular arrays and each having an inner surface, said inner surfaces being in mutual surface contact, and the microimages on one of said outer surfaces being reversed when viewed from a location outwardly of such outer surface.
Claim 3
Dependent Claim
22 words
A dual focus fiche assembly as claimed in claim 1, wherein the distance between said outer surfaces is less than 15 mils.
Claim 4
Dependent Claim
26 words
A dual focus fiche assembly as claimed in claim 2, wherein the distance between said outer surfaces is within a range between 10 and 15 mils.
Claim 5
Dependent Claim
117 words
In a dual focus fiche viewing system, the combination of: a. two superimposed transparent fiches each being a single sheet of a single material having an outer surface bearing microimages in perpendicular arrays and each having an inner surface, said inner surfaces being in mutual surface contact, and the microimages on one of said outer surfaces being reversed when viewed from a location outwardly of such outer surface; b. a lens on one side of said superimposed fiches; c. means for selectively causing said outer surfaces of said fiches and the focal plane of said lens to coincide; and d. means for relatively moving said superimposed fiches and said lens in the directions of said perpendicular arrays.
Claim 6
Dependent Claim
117 words
In a dual focus fiche viewing system, the combination of: a. two superimposed transparent fiches each being a single sheet of a single material having an outer surface bearing microimages in perpendicular arrays and each having an inner surface, said inner surfaces being in mutual surface contact, and the microimages on one of said outer surfaces being reversed when viewed from a location outwardly of such outer surface; b. a lens on one side of said superimposed fiches; c. means for selectively causing said outer surfaces of said fiches and the focal plane of said lens to coincide; and d. means for relatively moving said superimposed fiches and said lens in the directions of said perpendicular arrays.
Claim 7
Dependent Claim
143 words
In a dual focus fiche viewing system, the combination of: a. two superimposed transparent fiches each being a single sheet of a single maTerial having an outer surface bearing microimages in perpendicular arrays and each having an inner surface, said inner surfaces being in mutual surface contact, and the microimages on one of said outer surfaces being reversed when viewed from a location outwardly of such outer surface; b. a screen; c. means including a lens on one side of said superimposed fiches and a lamp on the other side thereof for projecting a microimage on one of said outer surfaces onto said screen; d. means for selectively causing said outer surfaces of said fiches and the focal plane of said lens to coincide; and e. means for relatively moving said superimposed fiches and said lens in the directions of said perpendicular arrays.
Claim 8
Dependent Claim
143 words
In a dual focus fiche viewing system, the combination of: a. two superimposed transparent fiches each being a single sheet of a single maTerial having an outer surface bearing microimages in perpendicular arrays and each having an inner surface, said inner surfaces being in mutual surface contact, and the microimages on one of said outer surfaces being reversed when viewed from a location outwardly of such outer surface; b. a screen; c. means including a lens on one side of said superimposed fiches and a lamp on the other side thereof for projecting a microimage on one of said outer surfaces onto said screen; d. means for selectively causing said outer surfaces of said fiches and the focal plane of said lens to coincide; and e. means for relatively moving said superimposed fiches and said lens in the directions of said perpendicular arrays.
References Cited (Backward Citations)
US3319518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |