US3658533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying process
Assignee: Horizons Research Inc
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Filing: 1969-06-11
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Granted: 1972-04-25
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Expires: 1989-06-11
Abstract
Abstract A photosensitive non-silver free radical film is placed in physical contact with copy material to be duplicated and on exposing the film to radiation from a powerful red light, either positive copy or negative copy is obtained.
Inventors
- 👤 Richard A Fotland
- 👤 Virgil E Straughan
- 👤 John Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/56; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/18; G03B27/22; G03C5/08; G03C5/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
14 words
bringing the sensitized copy sheet into physical contact with the document to be reproduced;
Claim 2
Dependent Claim
40 words
The process of claim 1 wherein a high contrast positive copy is obtained by adjusting the blanket exposure of step (1) to a relatively low level and providing a relatively high level of red and infrared radiation for optical development.
Claim 3
Dependent Claim
15 words
bringing the sensitized copy sheet into physiCal contact with the original document to be reproduced;
Claim 4
Dependent Claim
73 words
projecting red radiation onto said copy sheet in a manner such that the radiation passes through a heat-absorbing filter and at least one optical filter transmitting only in the red portion of the spectrum before it strikes the copy sheet and wherein said radiation strikes the copy sheet before it passes to the document to be reproduced, the amount of radiation projected being sufficient to produce an image on said copy sheet; and
Claim 5
Dependent Claim
40 words
The process of claim 1 wherein a low contrast positive copy is obtained by adjusting the blanket exposure of step (1) to a relatively high level and providing a relatively low level of red and infrared radiation for optical development.
Claim 6
Dependent Claim
75 words
projecting red and infrared radiation onto said copy sheet in a manner such that the radiation passes through at least one optical filter which transmits only in the red and infrared portions of the spectrum before said radiation strikes the copy sheet and wherein said radiation strikes the copy sheet before it passes to the document to be reproduced, the amount of radiation projected being sufficient to produce an image on said copy sheet; and
Claim 7
Dependent Claim
24 words
thereafter fixing the resulting image in the copy sheet by heating the sheet to a temperature of about 145* C for a short interval.
Claim 8
Independent Claim
12 words
A method of producing negative copies of an original document which comprises:
Claim 9
Dependent Claim
24 words
thereafter fixing the resulting image in the copy sheet by heating the sheet to a temperature of about 145* C for a short interval.
Claim 10
Dependent Claim
37 words
The process of claim 4 wherein a high contrast negative copy is obtained by adjusting the blanket exposure of step (1) to a relatively high level and providing a relatively low level of radiation for optical development.
Claim 11
Dependent Claim
37 words
The process of claim 4 wherein a low contrast negative copy is obtained by adjusting the blanket exposure of step (1) to a relatively low level and providing a relatively high level of radiation for optical development.
Claim 12
Dependent Claim
35 words
The process of claim 4 wherein the free radical film is a coating on one surface of the copy sheet, and that surface is the one in physical contact with the material to be reproduced.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |