US5121297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible printed circuits
Assignee: Hewlett Packard Development Co LP
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Filing: 1990-12-31
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Granted: 1992-06-09
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Expires: 2010-12-31
Abstract
Abstract The present invention provides flexible, tear-resistant printed circuits comprising first and second electrical conductors and a flexible, insulating core separating and supporting said first and second conductors. The core preferably comprises aromatic polyamide fiber in a resin binder matrix. Rigid/flex circuits including the flexible, tear-resistant printed circuits are disclosed.
Inventors
- 👤 Daniel P. Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:55
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4688; H05K3/4691; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/0278
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
163 words
A printed circuit board comprising: (a) at least first and second rigid printed circuit sections; (b) a flexible printed circuit comprising first and second conductors and a core having an LAT of at least 25 lb./mil separating and supporting said conductors, said flexible circuit having a minimum bend radius of no greater than 120 mil and wherein: (i) at least a first portion of said flexible core is connected to said first rigid printed circuit section; (ii) at least a second portion of said flexible core is connected to said second rigid printed circuit section; (iii) at least a third portion of said flexible core extends beyond the periphery of each of said rigid printed circuit sections; and (iv) at least one of said conductors electrically connects said first rigid printed circuit section to said second rigid circuit section, said flexible printed circuit thereby providing a tear-resistant electrical connection between said first rigid printed circuit section and said second rigid printed circuit section.
Claim 2
Dependent Claim
163 words
A printed circuit board comprising: (a) at least first and second rigid printed circuit sections; (b) a flexible printed circuit comprising first and second conductors and a core having an LAT of at least 25 lb./mil separating and supporting said conductors, said flexible circuit having a minimum bend radius of no greater than 120 mil and wherein: (i) at least a first portion of said flexible core is connected to said first rigid printed circuit section; (ii) at least a second portion of said flexible core is connected to said second rigid printed circuit section; (iii) at least a third portion of said flexible core extends beyond the periphery of each of said rigid printed circuit sections; and (iv) at least one of said conductors electrically connects said first rigid printed circuit section to said second rigid circuit section, said flexible printed circuit thereby providing a tear-resistant electrical connection between said first rigid printed circuit section and said second rigid printed circuit section.
Claim 3
Dependent Claim
100 words
The printed circuit board of claim 1 wherein: (a) said first and second rigid printed circuit sections comprise circuit sections having at least one generally planar surface thereof; (b) said core includes at least one generally planar surface; (c) at least a first portion of said generally planar core surface is bonded to at least a portion of the generally planar surface of said first rigid circuit section; and (d) at least a second portion of said generally planar core surface is bonded to at least a portion of the generally planar surface of said second rigid printed circuit section.
Claim 4
Dependent Claim
48 words
The printed circuit board of claim 2 wherein at least 5% of said generally planar surface of said first rigid printed circuit section is bound to said core and at least 5% of said generally planar surface of said second rigid circuit section is bound to said core.
Claim 5
Dependent Claim
21 words
The printed circuit board of claim 3 wherein said core has a minimum bend radius of no greater than 50 mil.
Claim 6
Dependent Claim
18 words
The printed circuit of claim 4 wherein said core has an LAT value of at least 28 lb./mil.
Claim 7
Dependent Claim
18 words
The printed circuit of claim 5 wherein the core has an LAT value of at least 30 lb./mil.
Claim 8
Dependent Claim
12 words
The printed circuit of claim 1 wherein said core comprises polyamide fiber.
Claim 9
Dependent Claim
14 words
The printed circuit board of claim 1 wherein said core comprises aromatic polyamide fiber.
Claim 10
Dependent Claim
14 words
The printed circuit board according to claim 8 wherein said fibers comprise woven fibers.
Claim 11
Dependent Claim
11 words
A portable computer comprising the printed circuit board of claim 1.
Claim 12
Dependent Claim
64 words
An improved printed circuit board comprising: (a) a rigid printed circuit section; and (b) a flexible printed circuit comprising a flexible, highly tear-resistant insulating core having an LAT value of at least 25 lb./mil, at least a first portion of said core being connected to said rigid circuit section, said flexible printed circuit having a minimum bend radius of no greater than 120 mil.
Claim 13
Dependent Claim
64 words
An improved printed circuit board comprising: (a) a rigid printed circuit section; and (b) a flexible printed circuit comprising a flexible, highly tear-resistant insulating core having an LAT value of at least 25 lb./mil, at least a first portion of said core being connected to said rigid circuit section, said flexible printed circuit having a minimum bend radius of no greater than 120 mil.
Claim 14
Dependent Claim
30 words
The printed circuit board of claim 11 wherein said core has an LAT value of at least 28 lb./mil and a minimum bend radius of no greater than 50 mil.
Claim 15
Dependent Claim
20 words
The printed circuit board according to claim 12 wherein said core has an LAT value of at least 30 lb./mil.
Claim 16
Dependent Claim
22 words
The printed circuit board according to claim 11 wherein said core has a minimum bend radius of no greater than 30 mil.
Claim 17
Dependent Claim
16 words
The printed circuit board according to claim 11 wherein said core comprises woven aromatic polyamide fiber.
Claim 18
Dependent Claim
30 words
The printed circuit board according to claim 15 wherein said core includes at least one generally planar surface and further comprising an electrical conductor supported on said planar core surface.
Claim 19
Dependent Claim
23 words
The printed circuit board according to claim 16 further comprising a second electrical conductor and wherein said core separates and supports said conductors.
Claim 20
Dependent Claim
11 words
A portable computer comprising the printed circuit board of claim 11.
Claim 21
Dependent Claim
59 words
A flexible, tear-resistant printed circuit having a minimum bend radius of no greater than 120 mil. and comprising at least first and second electrical conductors and a flexible, insulating core having an LAT value of at least 25 lb./mil separating and supporting said first and second conductors, said core comprising aromatic polyamide fiber in a matrix of resin binder.
Claim 22
Dependent Claim
59 words
A flexible, tear-resistant printed circuit having a minimum bend radius of no greater than 120 mil. and comprising at least first and second electrical conductors and a flexible, insulating core having an LAT value of at least 25 lb./mil separating and supporting said first and second conductors, said core comprising aromatic polyamide fiber in a matrix of resin binder.
Claim 23
Dependent Claim
25 words
The printed circuit of claim 19 having an LAT value of least 25 lb./mil and a minimum bend radius of no greater than 120 mil.
Claim 24
Dependent Claim
27 words
The printed circuit according to claim 20 having an LAT value of at least 28 lb./mil and a minimum bend radius of no greater than 70 mil.
Claim 25
Dependent Claim
38 words
A flexible printed circuit board having a minimum bend radius of at lest 120 mil. and comprising a first electrical conductor and an insulating core having an LAT value of at least 25 lb./mil supporting said first conductor.
Claim 26
Dependent Claim
38 words
A flexible printed circuit board having a minimum bend radius of at lest 120 mil. and comprising a first electrical conductor and an insulating core having an LAT value of at least 25 lb./mil supporting said first conductor.
Claim 27
Dependent Claim
31 words
The printed circuit board according to claim 22 wherein said core has an LAT value of at least 30 lb./mil and a minimum bend radius of no greater than 25 mil.
Claim 28
Dependent Claim
19 words
The printed circuit board according to claim 22 having a minimum bend radius of no greater than 70 mil.
Claim 29
Dependent Claim
20 words
The printed circuit board according to claim 24 wherein the core has an LAT value of at least 30 lb./mil.
Claim 30
Dependent Claim
14 words
The printed circuit according to claim 25 wherein said core comprises aromatic polyamide fiber.
Claim 31
Dependent Claim
14 words
The printed circuit board according to claim 26 wherein said fiber comprises woven fibers.
Claim 32
Dependent Claim
16 words
The printed circuit board according to claim 27 wherein said core further comprises epoxy resin binder.
Claim 33
Dependent Claim
11 words
A portable computer comprising the printed circuit board of claim 22.
Claim 34
Dependent Claim
31 words
The printed circuit board according to claim 22 wherein said core has an LAT value of at least 28 lb./mil and a minimum bend radius of no greater than 50 mil.
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) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |