US3645823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a microfiche
Assignee: Kalle GmbH and Co KG
•
Filing: 1969-11-24
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Granted: 1972-02-29
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Expires: 1989-11-24
Abstract
Abstract A microfiche is formed by coating a transparent support sheet with a layer of transparent potentially adhesive thermoplastic composition exhibiting low adhesive tackiness at ambient conditions, but which is heat-activatable to adhesive tackiness, positioning microfilm image elements on the layer under a sufficient pressure to superficially adhere the elements to the layer, and bringing the thermoplastic composition to adhesive tackiness in the areas of the microfilm elements. Reheating the thermoplastic composition in the areas of the microfilm elements renders the elements removable from the sheet, thus providing for replacement of microfilm elements to revise or update the microfiche.
Inventors
- 👤 Fritz Merk
- 👤 Gerhard Debus
- 👤 Herbert Ewald Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:26
CPC Classifications
G; G03; G03D; G03D15/00; G03D15/10; G03B; G03B17/00; G03B17/26; G03C; G03C11/00; G03C11/14; G03D15/04; G03D15/043; G03D15/046; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
35 words
The process according to claim 1 wherein said thermoplastic composition consists essentially of a blend of about equal parts of a 86:13:1 copolymer of vinyl chloride: vinyl acetate: unsaturated dicarboxylic acid, and hydrogenated methyl abietate.
Claim 2
Dependent Claim
21 words
The process according to claim 1 wherein said thermoplastic composition consists essentially of a 60:40 copolymer of vinyl acetate: dibutyl maleate.
Claim 3
Dependent Claim
42 words
The process according to claim 1 wherein said thermoplastic composition consists essentially of a mixture of about 37 parts of a copolymer of vinyl acetate: butyl acrylate, about 15 parts of polyvinyl acetate, and about 2 parts of a polyvinyl acetate plasticizer.
Claim 4
Dependent Claim
69 words
A process of revising or updating a microfiche prepared according to the process of claim 1 which comprises: a. heating the thermoplastic composition of said microfiche in the area occupied by a selected microfilm element to a temperature between about 50* C. and the deformation temperature of said element; and b. removing said selected element from said microfiche thermoplastic composition layer while said composition is in said heated condition.
Claim 5
Dependent Claim
39 words
A process according to claim 5 which additionally comprises replacing the thus removed microfilm element with a different microfilm element and reheating said thermoplastic composition to within said temperature range, thereby bonding said different element to the microfiche sheet.
References Cited (Backward Citations)
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US3083132A
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US3130099A
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US3165848A
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US3253360A
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US3275589A
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US3546053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |