Patent US5097390A successfully refreshed from Google Patents.
US5097390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit and fabrication of same
Assignee: Miraco Inc
•
Filing: 1988-06-22
•
Granted: 1992-03-17
•
Expires: 2008-06-22
Abstract
Abstract Apparatus and method for protecting intermediate layers of a multi-layer printed circuit board from chemical or other damage from processing of a layer or layers to which previously fabricated layers of the printed circuit board are attached prior to such additional processing. A thin layer of protective material is selectively attached to intermediate or inner layers of a multi-layer printed circuit board after fabrication of such layers, when the outer or subsequent layers are attached. Inner or intermediate layer(s) of a multi-layer printed circuit board are fabricated. When outer layer(s) of the resulting printed circuit board are attached to the inner or intermediate layer(s), a layer of protective material such as a thin sheet of chemical-resistive plastic is disposed between the inner or intermediate layer(s) and the outer layer(s) and is selectively or completely attached or bonded thereto such as with a layer of acrylic adhesive.
Inventors
- 👤 Richard W. Gerrie
- 👤 Victor F. Dahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:28
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4688; H05K3/4691; H05K3/4611; H05K3/4626; H05K3/4635; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0183; H05K2201/0195; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2201/09; H05K2201/09009; H05K2201/0909; H05K3/38; H05K3/386
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
117 words
A multilayer printed circuit, comprising: first and second layers, each comprising substantially dielectric material, said second layer being more flexible than said first layer, said first layer having an opening therethrough for which said second layer does not have a corresponding opening therethrough, the opening defining a portion of a future boundary between more flexible and less flexible portions of said printed circuit in its final condition, wherein said second layer bears at least one conductive path; and disposed between and bonded to said first and second layers, a third layer comprising substantially chemically nonpermeable material for chemically isolating said at least one conductive path against damage as the result of subsequent treatment of said printed circuit.
Claim 2
Dependent Claim
117 words
A multilayer printed circuit, comprising: first and second layers, each comprising substantially dielectric material, said second layer being more flexible than said first layer, said first layer having an opening therethrough for which said second layer does not have a corresponding opening therethrough, the opening defining a portion of a future boundary between more flexible and less flexible portions of said printed circuit in its final condition, wherein said second layer bears at least one conductive path; and disposed between and bonded to said first and second layers, a third layer comprising substantially chemically nonpermeable material for chemically isolating said at least one conductive path against damage as the result of subsequent treatment of said printed circuit.
Claim 3
Dependent Claim
42 words
A printed circuit as recited in claim 1 wherein said third layer comprising substantially chemically nonpermeable material is bonded to said first layer along an entire surface of said third layer facing said first layer and selectively bonded to said second layer.
Claim 4
Dependent Claim
24 words
A printed circuit as recited in claim 2 wherein said third layer comprising substantially chemically nonpermeable material comprises a layer of a polyimide material.
Claim 5
Dependent Claim
32 words
A printed circuit as recited in claim 3 wherein said polyimide material comprises a product of a polycondensation reaction between an aromatic diamine and an aromatic terabasic acid or an aromatic dianhydride.
Claim 6
Dependent Claim
23 words
A printed circuit as recited in claim 1 wherein said first layer includes metallic features on two opposite surfaces of said first layer.
Claim 7
Dependent Claim
82 words
A printed circuit as recited in claim 5 wherein said second layer comprises: a fourth layer comprising flexible material; a fifth layer comprising flexible material and bonded to said fourth layer and including at least one metallic feature on a surface of said fifth layer bonded to said fourth layer; and a sixth layer comprising flexible material and bonded to said fourth layer and bearing at least one metallic feature on a surface of said sixth layer bonded to said fourth layer.
Claim 8
Dependent Claim
118 words
A printed circuit, comprising: a first layer comprising a first material; a second layer comprising a second material more flexible than said first material, said second layer being bonded to said first layer along part of a surface of said second layer, such that respectively more and less flexible portions are formed with a first boundary defined therebetween; and a first member, distinct from said first and second layers and more flexible than said less flexible portion, extending from the first boundary into said more flexible portion for ameliorating stress at the first boundary, wherein the portion of said first member extending from the first boundary into said more flexible portion is smaller than said more flexible portion.
Claim 9
Dependent Claim
118 words
A printed circuit, comprising: a first layer comprising a first material; a second layer comprising a second material more flexible than said first material, said second layer being bonded to said first layer along part of a surface of said second layer, such that respectively more and less flexible portions are formed with a first boundary defined therebetween; and a first member, distinct from said first and second layers and more flexible than said less flexible portion, extending from the first boundary into said more flexible portion for ameliorating stress at the first boundary, wherein the portion of said first member extending from the first boundary into said more flexible portion is smaller than said more flexible portion.
Claim 10
Dependent Claim
24 words
A printed circuit as recited in claim 7 wherein said first member extends from between said first and second layers at the first boundary.
Claim 11
Dependent Claim
16 words
A printed circuit as recited in claim 8 wherein said first member comprises a resilient member.
Claim 12
Dependent Claim
28 words
A printed circuit as recited in claim 8 wherein said first member is connected to said more flexible portion along the entire facing surface of said first member.
Claim 13
Dependent Claim
33 words
A printed circuit as recited in claim 8 wherein said first member is connected to said more flexible portion along part of a surface of said first member facing said more flexible portion.
Claim 14
Dependent Claim
23 words
A printed circuit as recited in claim 8 wherein said first layer includes metallic features on two opposite surfaces of said first layer.
Claim 15
Dependent Claim
82 words
A printed circuit as recited in claim 8 wherein said second layer comprises: a third layer comprising flexible material; a fourth layer comprising flexible material and bonded to said third layer and including at least one metallic feature on a surface of said fourth layer bonded to said third layer; and a fifth layer comprising flexible material and bonded to said third layer and bearing at least one metallic feature on a surface of said fifth layer bonded to said third layer.
Claim 16
Dependent Claim
30 words
A printed circuit as recited in claim 8 wherein said first member is connected to said second layer along an entire surface of said first member facing said second layer.
Claim 17
Dependent Claim
35 words
A printed circuit as recited in claim 8 wherein a portion of said first member is connected to said second layer along a part of a surface of said first member facing said second layer.
Claim 18
Dependent Claim
16 words
A printed circuit as recited in claim 8 wherein said first member comprises a polyimide material.
Claim 19
Dependent Claim
32 words
A printed circuit as recited in claim 16 wherein said polyimide material comprises the product of a polycondensation reaction between an aromatic diamine and an aromatic terabasic acid or an aromatic dianhydride.
Claim 20
Dependent Claim
42 words
A printed circuit as recited in claim 8 wherein: said first material comprises a first dielectric material; said first layer further comprises at least one conductive path disposed on said first dielectric material; and said second material comprises a second dielectric material.
Claim 21
Dependent Claim
35 words
A printed circuit as recited in claim 8 wherein the portion of said first member extending from the first boundary into said more flexible portion is at least partially free of said more flexible portion.
Claim 22
Dependent Claim
82 words
A printed circuit as recited in claim 7, further comprising: a third layer comprising a third material less flexible than said second material, said third layer being bonded to said second layer along part of a surface of said second layer, such that respectively more and less flexible portions of the printed circuit are formed with a second boundary defined therebetween; and a second member extending from the second boundary into a more flexible portion for ameliorating stress at the second boundary.
Claim 23
Dependent Claim
32 words
A printed circuit as recited in claim 20 wherein the portion of said second member extending from the second boundary into said more flexible portion is smaller than said more flexible portion.
Claim 24
Dependent Claim
40 words
A printed circuit as recited in claim 20 wherein: said first member extends from between said first and second layers at the first boundary; and said second member extends from between said second and third layers at the second boundary.
Claim 25
Dependent Claim
133 words
A printed circuit, comprising: a first layer of a first material; a second layer of a second material more flexible than said first material, said second layer being bonded to said first layer along part of a surface of said second layer, such that respectively more and less flexible portions are formed with a first boundary defined therebetween; and a first member distinct from said first and second layers and composed of a third material more flexible than said first material, extending from the first boundary into said more flexible portion for ameliorating stress at the first boundary, wherein the portion of said first member extending from the first boundary into said more flexible portion is smaller than said more flexible portion and is at least partially free of said more flexible portion.
Claim 26
Dependent Claim
133 words
A printed circuit, comprising: a first layer of a first material; a second layer of a second material more flexible than said first material, said second layer being bonded to said first layer along part of a surface of said second layer, such that respectively more and less flexible portions are formed with a first boundary defined therebetween; and a first member distinct from said first and second layers and composed of a third material more flexible than said first material, extending from the first boundary into said more flexible portion for ameliorating stress at the first boundary, wherein the portion of said first member extending from the first boundary into said more flexible portion is smaller than said more flexible portion and is at least partially free of said more flexible portion.
Claim 27
Dependent Claim
82 words
A printed circuit as recited in claim 23, further comprising: a third layer comprising a third material less flexible than said second material, said third layer being bonded to said second layer along part of a surface of said second layer, such that respectively more and less flexible portions of the printed circuit are formed with a second boundary defined therebetween; and a second member extending from the second boundary into a more flexible portion for ameliorating stress at the second boundary.
Claim 28
Dependent Claim
40 words
A printed circuit as recited in claim 24 wherein: said first member extends from between said first and second layers at the first boundary; and said second member extends from between said second and third layers at the second boundary.
Claim 29
Dependent Claim
24 words
A printed circuit as recited in claim 23 wherein said first member extends from between said first and second layers at the first boundary.
Claim 30
Dependent Claim
16 words
A printed circuit as recited in claim 26 wherein said first member comprises a resilient member.
Claim 31
Dependent Claim
23 words
A printed circuit as recited in claim 26 wherein said first layer includes metallic features on two opposite surfaces of said first layer.
Claim 32
Dependent Claim
82 words
A printed circuit as recited in claim 26 wherein said second layer comprises: a third layer comprising flexible material; a fourth layer comprising flexible material and bonded to said third layer and including at least one metallic feature on a surface of said fourth layer bonded to said third layer; and a fifth layer comprising flexible material and bonded to said third layer and bearing at least one metallic feature on a surface of said fifth layer bonded to said third layer.
Claim 33
Dependent Claim
42 words
A printed circuit as recited in claim 26 wherein: said first material comprises a first dielectric material; said first layer further comprises at least one conductive path disposed on said first dielectric material; and said second material comprises a second dielectric material.
Claim 34
Dependent Claim
214 words
A multilayer printed circuit, comprising: first and second layers, each comprising substantially dielectric material, said first layer having an opening therethrough for which said second layer does not have a corresponding opening therethrough, the opening defining a portion of a future boundary between more flexible and less flexible portions of said printed circuit in its final condition, wherein said second layer bears at least one conductive path and said second layer is more flexible than said first layer; disposed between and bonded to said first and second layers, a third layer comprising substantially chemically nonpermeable material for chemically isolating said at least one conductive path against damage as the result of subsequent treatment of said printed circuit; a fourth layer comprising substantially dielectric material and less flexible than said second layer, said fourth layer having an opening therethrough for which said second layer does not have a corresponding opening therethrough, the opening defining a portion of a future boundary between more flexible and less flexible portions of said printed circuit in its final condition; and disposed between and bonded to said second and fourth layers, a fifth layer comprising substantially chemically nonpermeable material for chemically isolating said at least one conductive path against damage as the result of subsequent treatment of said printed circuit.
Claim 35
Dependent Claim
214 words
A multilayer printed circuit, comprising: first and second layers, each comprising substantially dielectric material, said first layer having an opening therethrough for which said second layer does not have a corresponding opening therethrough, the opening defining a portion of a future boundary between more flexible and less flexible portions of said printed circuit in its final condition, wherein said second layer bears at least one conductive path and said second layer is more flexible than said first layer; disposed between and bonded to said first and second layers, a third layer comprising substantially chemically nonpermeable material for chemically isolating said at least one conductive path against damage as the result of subsequent treatment of said printed circuit; a fourth layer comprising substantially dielectric material and less flexible than said second layer, said fourth layer having an opening therethrough for which said second layer does not have a corresponding opening therethrough, the opening defining a portion of a future boundary between more flexible and less flexible portions of said printed circuit in its final condition; and disposed between and bonded to said second and fourth layers, a fifth layer comprising substantially chemically nonpermeable material for chemically isolating said at least one conductive path against damage as the result of subsequent treatment of said printed circuit.
Claim 36
Dependent Claim
30 words
A printed circuit as recited in claim 31 wherein said third layer comprising substantially chemically nonpermeable material is bonded to said first layer and selectively bonded to said second layer.
Claim 37
Dependent Claim
28 words
A printed circuit as recited in claim 32 wherein: said first layer is substantially rigid; said second layer is substantially flexible; and said third layer is substantially rigid.
Claim 38
Dependent Claim
23 words
A printed circuit as recited in claim 32 wherein said first layer includes metallic features on two opposite surfaces of said first layer.
Claim 39
Dependent Claim
82 words
A printed circuit as recited in claim 34 wherein said second layer comprises: a fourth layer comprising flexible material; a fifth layer comprising flexible material and bonded to said fourth layer and including at least one metallic feature on a surface of said fifth layer bonded to said fourth layer; and a sixth layer comprising flexible material and bonded to said fourth layer and bearing at least one metallic feature on a surface of said sixth layer bonded to said fourth layer.
Claim 40
Dependent Claim
118 words
A multilayer material, comprising: a first layer comprising a first material; a second layer comprising a second material more flexible than said first material, said second layer being bonded to said first layer along part of a surface of said second layer, such that respectively more and less flexible portions of the multilayer material are formed with a first boundary defined therebetween; and a first member distinct from said first and second layers extending from between said first and second layers at the first boundary into said more flexible portion for ameliorating boundary stress, wherein the portion of said first member extending from the first boundary into said more flexible portion is smaller than said more flexible portion.
Claim 41
Dependent Claim
118 words
A multilayer material, comprising: a first layer comprising a first material; a second layer comprising a second material more flexible than said first material, said second layer being bonded to said first layer along part of a surface of said second layer, such that respectively more and less flexible portions of the multilayer material are formed with a first boundary defined therebetween; and a first member distinct from said first and second layers extending from between said first and second layers at the first boundary into said more flexible portion for ameliorating boundary stress, wherein the portion of said first member extending from the first boundary into said more flexible portion is smaller than said more flexible portion.
References Cited (Backward Citations)
US3228091A
Cited
US3105869A
Cited
US3409732A
Cited
US3471348A
Cited
US3851382A
Cited
US3772776A
Cited
US3888745A
Cited
JPS50158877A
Cited
US4037047A
Cited
US3939558A
Cited
US3999285A
Cited
US4063993A
Cited
US4026011A
Cited
US4064622A
Cited
US4081600A
Cited
US4420364A
Cited
US4095866A
Cited
US4268956A
Cited
US4241436A
Cited
US4343083A
Cited
US4316320A
Cited
US4287014A
Cited
US4296457A
Cited
JPS569778A
Cited
US4338149A
Cited
US4355463A
Cited
US4331740A
Cited
US4495546A
Cited
US4402131A
Cited
US4533787A
Cited
US4532575A
Cited
US4509095A
Cited
US4550357A
Cited
JPS6085873A
Cited
US4668332A
Cited
US4626462A
Cited
JPS6197877A
Cited
US4677529A
Cited
US4710854A
Cited
US4664962A
Cited
US4687695A
Cited
US4715928A
Cited
US4756940A
Cited
US4800461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |