Patent US4520485A successfully refreshed from Google Patents.
US4520485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device
Assignee: Panasonic Holdings Corp
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Filing: 1982-03-11
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Granted: 1985-05-28
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Expires: 2002-03-11
Abstract
Abstract On a semiconductor laser substrate, a groove of tapered width is formed, and at least one crystal layer is formed on the substrate. The crystal layer is usable as a waveguide with two light input ends l 1 and l 2 and one light output end l 3 as shown in FIG. 4(C).
Inventors
- 👤 Takashi Sugino
- 👤 Kunio Itoh
- 👤 Masaru Wada
- 👤 Hirokazu Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/20; H01S5/22; H01S5/223; H01S5/2232; H01S5/10; H01S5/1003; H01S5/1014; H01S5/1053; H01S5/1064; H01S5/2234; H01S5/2237; H01S5/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
In a semiconductor device the improvement comprising: a semiconductor substrate having a groove with widths differing at both ends on a principal surface, and a semiconductor crystal layer which is to serve as a waveguide and formed on all of said principal surface filling said groove.
Claim 2
Dependent Claim
46 words
In a semiconductor device the improvement comprising: a semiconductor substrate having a groove with widths differing at both ends on a principal surface, and a semiconductor crystal layer which is to serve as a waveguide and formed on all of said principal surface filling said groove.
Claim 3
Dependent Claim
30 words
A semiconductor device in accordance with claim 1, wherein a thickness of said semiconductor crystal layer is different between a part above said groove and other parts than said part.
Claim 4
Dependent Claim
37 words
A semiconductor device in accordance with claim 1, wherein said semiconductor crystal layer has an upper layer of larger refractive index and a lower layer of smaller refractive index, said upper layer constituting a light waveguide .
Claim 5
Dependent Claim
26 words
A semiconductor device in accordance with claim 1, wherein said semiconductor crystal layer has thicker parts at the corners of said groove than at other parts.
Claim 6
Dependent Claim
26 words
A semiconductor device in accordance with claim 3, wherein said upper layer has thicker parts at the corners of said groove than at other parts thereof.
Claim 7
Dependent Claim
32 words
A semiconductor device in accordance with claim 1, wherein said semiconductor crystal layer has a flat surface above a narrow groove portion and has a recessed surface above a wide groove portion.
Claim 8
Dependent Claim
77 words
In a semiconductor laser comprising: a semiconductor substrate having a groove with widths differing at both ends on a principal surface, a first clad layer of the same conductivity as said semiconductor substrate, an active layer of p- or n- conductivity type, and a second clad layer of the opposite conductivity to said semiconductor substrate, said first clad layer, said first active layer and said second active layer being formed on said main surface filling said groove.
Claim 9
Dependent Claim
77 words
In a semiconductor laser comprising: a semiconductor substrate having a groove with widths differing at both ends on a principal surface, a first clad layer of the same conductivity as said semiconductor substrate, an active layer of p- or n- conductivity type, and a second clad layer of the opposite conductivity to said semiconductor substrate, said first clad layer, said first active layer and said second active layer being formed on said main surface filling said groove.
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) | 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 |