Patent US4055424A successfully refreshed from Google Patents.
US4055424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel microfilm and process for preparation
Assignee: Xerox Corp
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Filing: 1976-05-07
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Granted: 1977-10-25
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Expires: 1996-05-07
Abstract
Abstract Microfilm structures of improved contrast are provided by coating a suitable transparent film substrate with an intermediate layer of a silicone elastomer which is abhesive to ink, coating said silicone with a surface layer of a photosensitive polymer which when exposed to activating electromagnetic radiation cross-links and chemically attaches to said silicone elastomer to form oleophilic ink accepting image areas, imagewise exposing said photosensitive polymer, removing the non-exposed, light sensitive polymer to form non-imaged areas of the abhesive silicone elastomer, and selectively inking the oleophilic image areas to form an imaged microfilm structure of improved image density and contrast.
Inventors
- 👤 Joseph Yung-Chang Chu
- 👤 Richard Louis Schank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:43
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54; G03F1/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A novel microfilm comprising a transparent film substrate, an intermediate silicone elastomer which is abhesive to ink and a surface layer of a photosensitive polymer which upon exposure to activating electromagnetic radiation crosslinks and chemically attaches to the silicone elastomer to form ink accepting image areas.
Claim 2
Dependent Claim
46 words
A novel microfilm comprising a transparent film substrate, an intermediate silicone elastomer which is abhesive to ink and a surface layer of a photosensitive polymer which upon exposure to activating electromagnetic radiation crosslinks and chemically attaches to the silicone elastomer to form ink accepting image areas.
Claim 3
Dependent Claim
17 words
The structure of claim 1 wherein the photosensitive polymer forms nitrenes upon exposure to activating electromagnetic radiation.
Claim 4
Dependent Claim
19 words
The structure of claim 1 wherein the abhesives silicone elastomer is formed of a polymer having a dimethylpolysiloxane backbone.
Claim 5
Dependent Claim
13 words
The structure of claim 1 wherein the surface layer is formed of poly[1-(β-oxyethyl-4'-sulfonylzido-carbanilate)-carbonyl-2-hydroxycarbonyl-3-methoxycarbonyl-4-tetramethylene].
Claim 6
Dependent Claim
136 words
A process for providing a microfilm structure comprising: a. providing a suitable transparent film substrate, b. coating said substrate with an intermediate layer of a silicone elastomer gum curable or coalesceable to an ink releasing abhesive condition, c. rendering said silicone inherently abhesive to ink, d. coating said silicone with a surface layer of a photosensitive polymer which then exposed to actinic radiation crosslinks and combines with said silicone elastomer to form oleophilic ink accepting image areas, e. imagewise exposing said photosensitive polymer to cause the polymer to become insoluble and combine with the silicone to form an image area f. removing the non-exposed, light sensitive polymer to form non-imaged areas of the abhesive silicone elastomer, and g. selectively inking the oleophilic image areas to form an imaged microfilm structure of improved image density and contrast.
Claim 7
Dependent Claim
136 words
A process for providing a microfilm structure comprising: a. providing a suitable transparent film substrate, b. coating said substrate with an intermediate layer of a silicone elastomer gum curable or coalesceable to an ink releasing abhesive condition, c. rendering said silicone inherently abhesive to ink, d. coating said silicone with a surface layer of a photosensitive polymer which then exposed to actinic radiation crosslinks and combines with said silicone elastomer to form oleophilic ink accepting image areas, e. imagewise exposing said photosensitive polymer to cause the polymer to become insoluble and combine with the silicone to form an image area f. removing the non-exposed, light sensitive polymer to form non-imaged areas of the abhesive silicone elastomer, and g. selectively inking the oleophilic image areas to form an imaged microfilm structure of improved image density and contrast.
Claim 8
Dependent Claim
19 words
The structure of claim 5 wherein the abhesive silicone elastomer is formed of a polymer having a dimethylpolysiloxane backbone.
Claim 9
Dependent Claim
13 words
The structure of claim 5 wherein the surface layer is formed of poly[1-(βoxyethyl-4'-sulfonylazido-carbanilate)-carbonyl-2-hydroxycarbonyl-3-methoxycarbonyl-4-tetramethylene].
Claim 10
Dependent Claim
42 words
An imaged microfilm comprising a transparent film substrate, an intermediate silicone elastomer which is adhesive to ink and an image formed of a olephilic photosensitive polymer which is attached to the silicone and which has a surface layer of an oleophilic ink.
Claim 11
Dependent Claim
42 words
An imaged microfilm comprising a transparent film substrate, an intermediate silicone elastomer which is adhesive to ink and an image formed of a olephilic photosensitive polymer which is attached to the silicone and which has a surface layer of an oleophilic ink.
Claim 12
Dependent Claim
19 words
The structure of claim 8 wherein the abhesive silicone elastomer is formed of a polymer haing a diemthylpolysiloxane backbone.
Claim 13
Dependent Claim
13 words
The structure of claim 8 wherein the surface layer is formed of poly[1-(β-oxyethyl-4'-sulfonylazido-carbanilate)-carbonyl-2-hydroxycarbonyl-3-methoxycarbonyl-4-tetramethylene].
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |