Patent US3862352A successfully refreshed from Google Patents.
US3862352A
Expired / Lapsed
US
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Photographically prepared electrical circuits wherein the photosensitive material is a photoconductor
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-04-16
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Granted: 1975-01-21
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Expires: 1988-04-16
Abstract
Abstract A printed production process wherein the latent image of a desired circuit is exposed on a film of photoconductive material and then the latent image is developed into an electrically conductive circuit image.
Inventors
- 👤 Elliot Berman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:59
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/02; G03C; G03C1/00; G03C1/705; H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/185; H10; H10D; H10D84/00; H10D84/01; H05K1/00; H05K1/16; H05K1/162
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
100 words
A PROCESS FOR MAKING ELECTRICAL CIRCUITS COMPRISING THE STEPS OF EXPOSING A MEDIUM COMPRISING A LAYER OF PHOTOCONDUCTIVE TITANIUM DIOXIDE WHICH BECOMES REVERSIBLY ACTIVATED UPON EXPOSURE, THEREBY BECOMING CAPABLE OF CAUSING CHEMICAL REACTION IN EXPOSED PORTIONS AND THEREBY FORMING AN IMAGE OF AN LECTRICAL CIRCUIT ON SAID LAYER OF PHOTOCONDUCTIVE MATERIAL, AND CONTACTING SAID IMAGE WITH A DEVELOPER SUBSTANCE WHICH UNDERGOES AND OXIDIATION/REDUCTION TYPE REACTION UPON CONTACT WITH THE EXPOSED ACTIVATED PHOTOCONDUCTIVE MATERIAL AND THAT DEPOSITS THEREON AN ELECTRICALLY CONDUCTIVE METAL LAYER AND THAT DEPOSITS THEREON AN ELECTRICALLY CONDUCTIVE ADAPTED TO RECEIVE ELECTRICAL COMPONENTS SUITABLE FOR CONNECTION IN SAID CIRCUIT.
Claim 2
Dependent Claim
100 words
A PROCESS FOR MAKING ELECTRICAL CIRCUITS COMPRISING THE STEPS OF EXPOSING A MEDIUM COMPRISING A LAYER OF PHOTOCONDUCTIVE TITANIUM DIOXIDE WHICH BECOMES REVERSIBLY ACTIVATED UPON EXPOSURE, THEREBY BECOMING CAPABLE OF CAUSING CHEMICAL REACTION IN EXPOSED PORTIONS AND THEREBY FORMING AN IMAGE OF AN LECTRICAL CIRCUIT ON SAID LAYER OF PHOTOCONDUCTIVE MATERIAL, AND CONTACTING SAID IMAGE WITH A DEVELOPER SUBSTANCE WHICH UNDERGOES AND OXIDIATION/REDUCTION TYPE REACTION UPON CONTACT WITH THE EXPOSED ACTIVATED PHOTOCONDUCTIVE MATERIAL AND THAT DEPOSITS THEREON AN ELECTRICALLY CONDUCTIVE METAL LAYER AND THAT DEPOSITS THEREON AN ELECTRICALLY CONDUCTIVE ADAPTED TO RECEIVE ELECTRICAL COMPONENTS SUITABLE FOR CONNECTION IN SAID CIRCUIT.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein said developing step comprising contacting the image with a developer comprising metal ions.
Claim 4
Dependent Claim
66 words
An electrical device comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and an electrically conductive metal circuit image photographically developed on said layer and adapted for connection to a source of electrical power and wherein said device comprises receptacle means adapted to receive electrical components suitable for connection to said circuit image.
Claim 5
Dependent Claim
66 words
An electrical device comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and an electrically conductive metal circuit image photographically developed on said layer and adapted for connection to a source of electrical power and wherein said device comprises receptacle means adapted to receive electrical components suitable for connection to said circuit image.
Claim 6
Dependent Claim
14 words
An electrical device according to claim 3 wherein said photoconductive material comprises titanium dioxide.
Claim 7
Dependent Claim
62 words
An electrical device comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and an electrically conductive metal circuit image photographically developed on said layer and adapted for connection to a source of electrical power wherein said circuit image comprises a plurality of discrete path portions of varying specific resistance.
Claim 8
Dependent Claim
62 words
An electrical device comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and an electrically conductive metal circuit image photographically developed on said layer and adapted for connection to a source of electrical power wherein said circuit image comprises a plurality of discrete path portions of varying specific resistance.
Claim 9
Dependent Claim
14 words
An electrical device according to claim 5 wherein said photoconductive material comprises titanium dioxide.
Claim 10
Dependent Claim
25 words
An electrical device according to claim 6 wherein said substrate comprises receptacle means adapted to receive electrical components suitable for connection to said circuit image.
Claim 11
Dependent Claim
100 words
A process for making electrical circuits comprising the steps of exposing a medium comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and thereby forming an image of an electrical circuit on said layer of photoconductive material, and contacting said image with a developer substance which undergoes an oxidation/reduction type reaction upon contact with the exposed activated photoconductive material and that deposits thereon an electrically conductive metal layer and wherein said exposing step comprises forming physically developable images of both conductors and resistors on said photoconductive layer.
Claim 12
Dependent Claim
100 words
A process for making electrical circuits comprising the steps of exposing a medium comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and thereby forming an image of an electrical circuit on said layer of photoconductive material, and contacting said image with a developer substance which undergoes an oxidation/reduction type reaction upon contact with the exposed activated photoconductive material and that deposits thereon an electrically conductive metal layer and wherein said exposing step comprises forming physically developable images of both conductors and resistors on said photoconductive layer.
Claim 13
Dependent Claim
39 words
A process according to claim 8 wherein said exposing step comprises exposing to one level of activating energy, to form an image of conductors, and exposing to a lower level of activating energy to form an image of resistors.
Claim 14
Dependent Claim
64 words
An electrical device comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and an electrically conductive metal circuit image photographically developed on said layer and adapted for connection to a source of electrical power and wherein said photoconductive material comprises titanium dioxide having a particle size less than about 250 millimicrons.
Claim 15
Dependent Claim
64 words
An electrical device comprising a layer of photoconductive material which becomes reversibly activated upon exposure, thereby becoming capable of causing chemical reactions in exposed portions and an electrically conductive metal circuit image photographically developed on said layer and adapted for connection to a source of electrical power and wherein said photoconductive material comprises titanium dioxide having a particle size less than about 250 millimicrons.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |