US4906885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode material for surface acoustic wave devices and surface acoustic wave device using the same
Assignee: Hitachi Ltd
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Filing: 1988-09-21
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Granted: 1990-03-06
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Expires: 2008-09-21
Abstract
Abstract A surface acoustic wave device has its inter-digital transducers made of a 3-metal alloyed material consisting of aluminum, copper and magnesium.
Inventors
- 👤 Hiroomi Kojima
- 👤 Toyoji Tabuchi
- 👤 Mitsutaka Hikita
- 👤 Kazuhito Kurosawa
- 👤 Atsushi Sumioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:36
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/06; H03; H03H; H03H3/00; H03H3/007; H03H3/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
35 words
An electrode material comprising three-metal alloyed material consisting of aluminum, copper and magnesium, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 0<y<3.5, 0<x<2.0 0<x+y≦3.4.
Claim 2
Dependent Claim
35 words
An electrode material comprising three-metal alloyed material consisting of aluminum, copper and magnesium, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 0<y<3.5, 0<x<2.0 0<x+y≦3.4.
Claim 3
Dependent Claim
45 words
An electrode material comprising three-metal alloyed material consisting of aluminum, copper and magnesium, wherein said three-metal of aluminum, copper and magnesium, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 1.8≦y≦2.2, 0.2≦x ≦1.6, 0<x+y ≦3.4.
Claim 4
Dependent Claim
45 words
An electrode material comprising three-metal alloyed material consisting of aluminum, copper and magnesium, wherein said three-metal of aluminum, copper and magnesium, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 1.8≦y≦2.2, 0.2≦x ≦1.6, 0<x+y ≦3.4.
Claim 5
Dependent Claim
58 words
A surface acoustic wave device having a thin film stripe on a substrate which propagates a surface acoustic wave, wherein said thin film stripe is formed of three-metal alloyed material consisting of aluminum, copper and magnesium, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 0<y<3.5, 0<x<2.0, 0<x+y≦3.4.
Claim 6
Dependent Claim
58 words
A surface acoustic wave device having a thin film stripe on a substrate which propagates a surface acoustic wave, wherein said thin film stripe is formed of three-metal alloyed material consisting of aluminum, copper and magnesium, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 0<y<3.5, 0<x<2.0, 0<x+y≦3.4.
Claim 7
Dependent Claim
31 words
A surface acoustic wave device according to claim 3, wherein said three-metal alloyed material of aluminum, copper and magnesium has a composition Al-Cu-Mg (100-x-y, y, x) which meets: 1.8≦y≦2.2, 0.2≦x≦1.6, 0<x+y≦3.4.
Claim 8
Dependent Claim
24 words
A surface acoustic wave device according to claim 3, wherein said thin film stripe comprises a thin film stripe which forms an interdigital transducer.
Claim 9
Dependent Claim
23 words
A surface acoustic wave device according to claim 3, wherein said thin film stripe comprises a thin film stripe which forms a reflector.
Claim 10
Dependent Claim
24 words
A surface acoustic wave device according to claim 3, wherein said thin film stripe comprises a thin film stripe which forms a directional coupler.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |