Patent US4520067A successfully refreshed from Google Patents.
US4520067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition useful for making circuit board substrates and electrical connectors
Assignee: Syensqo Specialty Polymers USA LLC
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Filing: 1983-07-25
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Granted: 1985-05-28
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Expires: 2003-07-25
Abstract
Abstract Described herein is a composition useful for making circuit board substrates and electrical connectors comprising a blend of a poly(ether sulfone) and polysulfone. Also described herein is a circuit board substrate and an electrical connector made from such a blend.
Inventors
- 👤 James E. Harris
- 👤 Lloyd M. Robeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:21
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0333; C; C08; C08L; C08L71/00; C08L81/00; C08L81/06; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/31533; Y10T428/31678
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A circuit board substrate comprising from about 40 to about 90 weight percent of a poly(ether sulfone) of the following formula: ##STR10## and from about 10 to about 60 weight percent of a polysulfone of the following formula: ##STR11## wherein R is selected from O and S an each R 1 independently hydrogen, a halogen atom, an alkyl group of from 1 to 4 carbon atoms and an alkoxy group of from 1 to 4 carbon atoms, a is an integer of 0 to 4 and R 2 is a bond between aromatic carbon atoms or a divalent connecting radical.
Claim 2
Dependent Claim
100 words
A circuit board substrate comprising from about 40 to about 90 weight percent of a poly(ether sulfone) of the following formula: ##STR10## and from about 10 to about 60 weight percent of a polysulfone of the following formula: ##STR11## wherein R is selected from O and S an each R 1 independently hydrogen, a halogen atom, an alkyl group of from 1 to 4 carbon atoms and an alkoxy group of from 1 to 4 carbon atoms, a is an integer of 0 to 4 and R 2 is a bond between aromatic carbon atoms or a divalent connecting radical.
Claim 3
Dependent Claim
18 words
A circuit board substrate as defined in claim 1 wherein the substrate further contains a particulate inorganic filler.
Claim 4
Dependent Claim
14 words
A circuit board substrate as defined in claim 2 wherein the filler is wollastonite.
Claim 5
Dependent Claim
14 words
The circuit board of claim 1 having a copper electrical circuit firmly adhered thereto.
Claim 6
Dependent Claim
21 words
A circuit board substrate as defined in claim 1 wherein the poly(ether sulfone) has repeating units of the following formula: ##STR12##
Claim 7
Dependent Claim
55 words
A circuit board substrate as defined in claim 1 wherein the poly(ether sulfone) contains units of the formula: ##STR13## wherein b is independently an integer of 1 to 3 Wherein the ratio of unit (I) to unit (II) is greater than 1 and units (I) and (II) are attached to each other by an --0--bond.
Claim 8
Dependent Claim
19 words
A circuit board substrate as defined in claim 6 wherein the poly(ether sulfone) contains units of the formula: ##STR14##
Claim 9
Dependent Claim
19 words
A circuit board substrate as defined in claim 1 wherein the polysulfone has repeating units of the formula: ##STR15##
Claim 10
Dependent Claim
17 words
A circuit board substrate as defined in claim 1 wherein the substrate further contains a reinforcing fiber.
Claim 11
Dependent Claim
14 words
A circuit board substrate as defined in claim 9 wherein the fiber is fiberglass.
Claim 12
Dependent Claim
22 words
A circuit board substrate as defined in claim 1 wherein the substrate further contains a reinforcing fiber and a particulate inorganic filler.
Claim 13
Dependent Claim
14 words
A circuit board substrate as defined in claim 11 which contains fiberglass and wollastonite.
References Cited (Backward Citations)
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |