US4396900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film microstrip circuits
Assignee: NAVY United States, AS REPRESENTED BY
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Filing: 1982-03-08
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Granted: 1983-08-02
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Expires: 2002-03-08
Abstract
Abstract A four layer thin film metallization system is comprised of layers of tantalum, chromium, copper and gold and is useful in high resolution, low loss microstrip circuits. The metallization system is compatible with lead-tin solder and, in addition, provides low insertion losses at X-band frequencies.
Inventors
- 👤 Ronald D. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/388; H10; H10D; H10D86/00; H10D86/80; H10D86/85; H05K1/00; H05K1/02; H05K1/0213; H05K1/0237; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A thin film microstrip circuit having low insertion loss at X-band frequency and being highly solderable with lead-tin solder comprising, a non-metallic substrate, a layer of tantalum fused onto said substrate, a layer of chromium having a thickness of about 200 Angstroms fused onto said layer of tantalum, a layer of copper having a thickness of about 50,000 Angstroms fused onto said layer of chromium, and a layer of gold having a thickness of about 7,000 Angstroms fused onto said layer of copper.
Claim 2
Dependent Claim
83 words
A thin film microstrip circuit having low insertion loss at X-band frequency and being highly solderable with lead-tin solder comprising, a non-metallic substrate, a layer of tantalum fused onto said substrate, a layer of chromium having a thickness of about 200 Angstroms fused onto said layer of tantalum, a layer of copper having a thickness of about 50,000 Angstroms fused onto said layer of chromium, and a layer of gold having a thickness of about 7,000 Angstroms fused onto said layer of copper.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |