Patent US4569885A successfully refreshed from Google Patents.
US4569885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film for forming printed circuit
Assignee: Nitto Denko Corp
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Filing: 1984-11-19
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Granted: 1986-02-11
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Expires: 2004-11-19
Abstract
Abstract A polyester film for printed circuits to be used as a base in a printed circuit base plate or as a base and/or cover layer in a printed circuit board, which undergoes a degree of dimensional stability of not more than 1% in both the longitudinal and transverse directions when kept at 150° C. for 30 minutes, and which is obtained by heat treating an extrusion molded and stretched polyester film at 150° C. to 240° C. without applying tension.
Inventors
- 👤 Katsuhiko Yamaguchi
- 👤 Seiki Kobayashi
- 👤 Yasufumi Miyake
- 👤 Akio Tsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:24
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/281; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0326; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0145; H05K3/38; H05K3/386; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24678; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A polyester film for printed circuits to be used as a base in a printed circuit base plate or as a base and/or cover layer in a printed circuit board, which undergoes a degree of dimensional stability of not more than 1% in both the longitudinal and transverse directions when kept at 150° C. for 30 minutes, and which is obtained by heat treating an extrusion molded and stretched polyester film at 150° C. to 240° C. without applying tension, wherein said extrusion molded and stretched film is a polyethylene terephthalate film, and wherein said polyester film has a refractive index of 1.4990 or more, measured by an Abbe refractometer, in the thickness direction.
Claim 2
Dependent Claim
114 words
A polyester film for printed circuits to be used as a base in a printed circuit base plate or as a base and/or cover layer in a printed circuit board, which undergoes a degree of dimensional stability of not more than 1% in both the longitudinal and transverse directions when kept at 150° C. for 30 minutes, and which is obtained by heat treating an extrusion molded and stretched polyester film at 150° C. to 240° C. without applying tension, wherein said extrusion molded and stretched film is a polyethylene terephthalate film, and wherein said polyester film has a refractive index of 1.4990 or more, measured by an Abbe refractometer, in the thickness direction.
Claim 3
Dependent Claim
23 words
The polyester film for forming printed circuits as claimed in claim 1, which has a heat resistant adhesive layer on one side thereof.
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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |