US4900878A
Expired / Lapsed
US
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Circuit terminations having improved electrical and structural integrity
Assignee: Raytheon Co
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Filing: 1988-10-03
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Granted: 1990-02-13
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Expires: 2008-10-03
Abstract
Abstract Terminations (10, 40, 70, 90) for flexible printed circuitry comprises thermosetting epoxy or polyimide prepreg sheets (36, 56, 64, 88, 102) in the rigid portion, instead of thermoplastic acrylic adhesive, partial coverlays (20, 50, 84, 94) instead of full coverlays and, as desired, rigidized members of epoxy or polyimide glass (16, 52, 54, 86) or prepreg internally as well as externally of the terminations. Anchor pads 34 secured to plated-through holes (38) minimize z-axis expansion of the terminations.
Inventors
- 👤 Elie J. Ichkhan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:36
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; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/0183; H05K2201/0187; H05K2201/09; H05K2201/09009; H05K2201/09109; H05K3/40; H05K3/42; H05K3/429
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
65 words
A termination for an electrical circuit with improved electrical and structural integrity comprising: joined layers of electrically insulating and conductive material; and at least one layer including a stiffener material of thermosetting composition, said layers of electrically insulating and conductive materials and said stiffener material layer including at least one substantially planarly arranged longitudinally extending layer consisting of a prepreg sheet and a coverlay sheet.
Claim 2
Dependent Claim
65 words
A termination for an electrical circuit with improved electrical and structural integrity comprising: joined layers of electrically insulating and conductive material; and at least one layer including a stiffener material of thermosetting composition, said layers of electrically insulating and conductive materials and said stiffener material layer including at least one substantially planarly arranged longitudinally extending layer consisting of a prepreg sheet and a coverlay sheet.
Claim 3
Dependent Claim
18 words
A circuit termination according to claim 1 in which said thermosetting composition includes fiber glass and epoxy resin.
Claim 4
Dependent Claim
15 words
A circuit termination according to claim 1 in which said thermosetting composition includes polyimide material.
Claim 5
Dependent Claim
18 words
A circuit termination according to claim 1 in which said thermosetting composition includes at least one prepreg sheet.
Claim 6
Dependent Claim
68 words
A termination for an electrical circuit with improved electrical and structural integrity comprising: joined layers of electrically insulating and conductive material; at least one layer including a stiffener material of thermosetting composition; plated-through holes extending through said layers; and anchor pads placed internally within the terminations and between said layers, and bonded to and extending outwardly from said plated-through holes for minimizing z-axis expansion of said joined layers.
Claim 7
Dependent Claim
68 words
A termination for an electrical circuit with improved electrical and structural integrity comprising: joined layers of electrically insulating and conductive material; at least one layer including a stiffener material of thermosetting composition; plated-through holes extending through said layers; and anchor pads placed internally within the terminations and between said layers, and bonded to and extending outwardly from said plated-through holes for minimizing z-axis expansion of said joined layers.
Claim 8
Dependent Claim
17 words
A circuit termination according to claim 5 further including interconnections connecting selected ones of said anchor pads.
Claim 9
Dependent Claim
68 words
A termination for an electrical circuit with improved electrical and structural integrity comprising: joined layers of electrically insulating and conductive material; and at least one layer including a stiffener material of thermosetting composition, said layers of electrically insulating and conductive material comprising a dielectric layer and conductive material including a perforated section secured to and extending substantially continuously across the entire breadth and length of said dielectric layer.
Claim 10
Dependent Claim
68 words
A termination for an electrical circuit with improved electrical and structural integrity comprising: joined layers of electrically insulating and conductive material; and at least one layer including a stiffener material of thermosetting composition, said layers of electrically insulating and conductive material comprising a dielectric layer and conductive material including a perforated section secured to and extending substantially continuously across the entire breadth and length of said dielectric layer.
Claim 11
Dependent Claim
42 words
A circuit termination according to claim 7 in which said conductive material further includes anchor pads adjacent to said perforated section, and plated-through holes extending through the layers and bonded to the anchor pads for minimizing z-axis expansion of said joined layers.
Claim 12
Dependent Claim
37 words
A circuit termination according to claim 8 further including additional anchor pads placed internally within the circuit and between the layers and bonded also to said additional anchor pads for minimizing z-axis expansion of said joined layers.
Claim 13
Dependent Claim
43 words
A termination for a flat electrical circuit comprising layers of electrically insulating and conductive material and including a dielectric layer and conductive material including a perforated section secured to and extending substantially continuously across the entire breadth and length of said dielectric layer.
Claim 14
Dependent Claim
43 words
A termination for a flat electrical circuit comprising layers of electrically insulating and conductive material and including a dielectric layer and conductive material including a perforated section secured to and extending substantially continuously across the entire breadth and length of said dielectric layer.
Claim 15
Dependent Claim
44 words
A circuit termination of a lamination of electrically insulating and conductive material comprising plated-through holes extending through the lamination and anchor pads placed internally of the lamination and bonded to and extending outwardly from said plated-through holes for minimizing z-axis expansion of the lamination.
Claim 16
Dependent Claim
44 words
A circuit termination of a lamination of electrically insulating and conductive material comprising plated-through holes extending through the lamination and anchor pads placed internally of the lamination and bonded to and extending outwardly from said plated-through holes for minimizing z-axis expansion of the lamination.
Claim 17
Dependent Claim
17 words
A circuit termination according to claim 11 further including interconnections connecting selected ones of said anchor pads.
Claim 18
Independent Claim
67 words
A method for fabricating an electric cable and terminations therefor comprising the steps of: providing a layer of electrically insulating and conductive material; and bonding a stiffener core including a thermosetting composition to the layer by lightly pressing the stiffener core and the layer to a prepreg sheet to form an initial bonding, and increasing the pressure under sufficient pressure, temperature and time to complete the bonding.
Claim 19
Independent Claim
67 words
A method for fabricating an electric cable and terminations therefor comprising the steps of: providing a layer of electrically insulating and conductive material; and bonding a stiffener core including a thermosetting composition to the layer by lightly pressing the stiffener core and the layer to a prepreg sheet to form an initial bonding, and increasing the pressure under sufficient pressure, temperature and time to complete the bonding.
Claim 20
Dependent Claim
26 words
A method according to claim 13 in which the thermosetting composition is selected from the group consisting of polyimide material, a thermosetting resin and a prepreg.
Claim 21
Dependent Claim
32 words
A method according to claim 14 in which the prepreg is selected from the group consisting of a fiber glass and epoxy resin composite and a fiber glass and polyimide resin composite.
Claim 22
Dependent Claim
67 words
A method according to claim 13 further comprising: the pre-bonding steps of incorporating pads of electrically conductive material in the core and the layer and aligning selected ones of the layer and core pads; and the post-bonding steps of forming plated-through holes in the layer and the core and the electrically conductive pads therein, and bonding the plated-through holes to aligned ones of the electrically conductive pads.
Claim 23
Dependent Claim
27 words
A method according to claim 16 in which said pad incorporating step includes the step of providing interconnections among selected ones of the pads in the core.
Claim 24
Dependent Claim
53 words
A method according to claim 16 in which said layer providing step includes the step of providing an electric shield on a sheet of dielectric material, said shield providing step comprising the steps of placing a perforated shield of electrically conductive material over substantially the entire breadth and width of the dielectric sheet.
Claim 25
Dependent Claim
55 words
A method according to claim 18 in which said shield providing step further comprises the steps of: incorporating pads of electrically conductive material within electrically insulated islands surrounded by the perforated sheet in alignment with selected ones of the layer and core pads; and bonding the shield pads to selected ones of the plated-through holes.
Claim 26
Dependent Claim
32 words
A method according to claim 18 in which said shield providing step further comprises the step of incorporating pads of electrically conductive material within electrically insulated islands surrounded by the perforated sheet.
Claim 27
Independent Claim
50 words
A method for fabricating an electric cable and terminations therefor comprising the steps of: placing a perforated shield of electrically conductive material over substantially the entire breadth and width of a dielectric sheet to form a layer therefrom; and bonding a stiffener core including a thermosetting composition to the layer.
Claim 28
Independent Claim
50 words
A method for fabricating an electric cable and terminations therefor comprising the steps of: placing a perforated shield of electrically conductive material over substantially the entire breadth and width of a dielectric sheet to form a layer therefrom; and bonding a stiffener core including a thermosetting composition to the layer.
Claim 29
Dependent Claim
26 words
A method according to claim 21 in which the thermosetting composition is selected from the group consisting of polyimide material, a thermosetting resin and a prepreg.
Claim 30
Dependent Claim
32 words
A method according to claim 22 in which the prepreg is selected from the group consisting of a fiber glass and epoxy resin composite and a fiber glass and polyimide resin composite.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |