Patent EP0774926B1 successfully refreshed from Google Patents.
US4863808A
Expired / Lapsed
US
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Copper-chromium-polyimide composite
Assignee: Gould Electronics Inc
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Filing: 1988-06-20
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Granted: 1989-09-05
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Expires: 2008-06-20
Abstract
Abstract A carrier for use in flexible circuits and tape-automated-bonding includes a layer of vacuum deposited metallic chromium between the copper and polyimide. The chromium is vacuum deposited on the polyimide, affords resistance to undercutting from gold and tin plating baths, and allows conductor to be deposited on both sides of the polyimide.
Inventors
- 👤 Jerome S. Sallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/244; C; C25; C25D; C25D5/00; C25D5/54; C25D5/56; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K3/38; H05K3/388; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/60; H10W70/62; H10W70/66; H10W70/67; H10W70/69; H10W70/695; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; Y; Y10; Y10S; Y10S205/00; Y10S205/924; Y10S205/926; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12396; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
39 words
A carrier comprising: a layer of dimensionally stable polyimide film; a layer of metallic chromium vapor-deposited on said polyimide; a layer of copper vapor-deposited on said chromium layer; and a layer of copper electrodeposited on said vapor-deposited copper layer.
Claim 2
Dependent Claim
39 words
A carrier comprising: a layer of dimensionally stable polyimide film; a layer of metallic chromium vapor-deposited on said polyimide; a layer of copper vapor-deposited on said chromium layer; and a layer of copper electrodeposited on said vapor-deposited copper layer.
Claim 3
Dependent Claim
18 words
The carrier of claim 1 wherein said chromium layer has a thickness of from 50 to 500 Angstroms.
Claim 4
Dependent Claim
17 words
The carrier of claim 2 wherein said electrodeposited copper layer has a thickness of about 25 micrometers.
Claim 5
Dependent Claim
17 words
The carrier of claim 1 further comprising a layer of gold plated on said electrodeposited copper layer.
Claim 6
Dependent Claim
19 words
The carrier of claim 1 further comprising a layer of tin or solder deposited on said electrodeposited copper layer.
Claim 7
Dependent Claim
29 words
The carrier of claim 1 wherein said electrodeposited copper layer forms a desired pattern of copper beams and further comprising a layer of gold plated on said copper beams.
Claim 8
Dependent Claim
31 words
The carrier of claim 1 wherein said electrodeposited copper layer forms a desired pattern of copper beams and further comprising a layer of tin or solder deposited on said copper beams.
Claim 9
Dependent Claim
17 words
The carrier of claim 1 wherein said vapor-deposited copper layer has a thickness of about 1000 Angstroms.
Claim 10
Dependent Claim
47 words
A carrier comprising: a layer of dimensionally stable polyimide film; a layer of metallic chromium vapor-deposited on each side of said polyimide layer; a layer of copper vapor-deposited on each of said chromium layers; and a layer of copper electrodeposited on each of said vapor-deposited copper layers.
Claim 11
Dependent Claim
47 words
A carrier comprising: a layer of dimensionally stable polyimide film; a layer of metallic chromium vapor-deposited on each side of said polyimide layer; a layer of copper vapor-deposited on each of said chromium layers; and a layer of copper electrodeposited on each of said vapor-deposited copper layers.
Claim 12
Dependent Claim
18 words
The carrier of claim 9 wherein each chromium layer has a thickness of from 50 to 500 Angstroms.
Claim 13
Dependent Claim
17 words
The carrier of claim 10 wherein each electrodeposited copper layer has a thickness of about 25 micrometers.
Claim 14
Dependent Claim
19 words
The carrier of claim 9 further comprising a layer of gold plated on each of said electrodeposited copper layers.
Claim 15
Dependent Claim
42 words
The carrier of claim 9 wherein at least one of said electrodeposited copper layers forms a desired pattern of copper beams and further comprising a layer of gold plated on at least one of said electrodeposited copper layers and said copper beams.
Claim 16
Independent Claim
58 words
A method of manufacturing a carrier having improved resistance to undercutting from gold or tin plating baths comprising the steps of: providing a dimensionally stable polyimide substrate; vapor depositing a layer of metallic chromium on said polyimide; vapor depositing a layer of copper onto said chromium layer; and electrodepositing a layer of copper on said vapor-deposited copper layer.
Claim 17
Independent Claim
58 words
A method of manufacturing a carrier having improved resistance to undercutting from gold or tin plating baths comprising the steps of: providing a dimensionally stable polyimide substrate; vapor depositing a layer of metallic chromium on said polyimide; vapor depositing a layer of copper onto said chromium layer; and electrodepositing a layer of copper on said vapor-deposited copper layer.
Claim 18
Dependent Claim
18 words
The method of claim 14 wherein said chromium layer has a thickness of from 50 to 500 Angstroms.
Claim 19
Dependent Claim
17 words
The method of claim 15 wherein said electrodeposited copper layer has a thickness of about 25 micrometers.
Claim 20
Dependent Claim
18 words
The method of claim 16 wherein said vapor deposited copper layer has a thickness of about 1000 Angstroms.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |