US5572619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polimide optical waveguide
Assignee: NTT Inc
•
Filing: 1995-04-19
•
Granted: 1996-11-05
•
Expires: 2015-04-19
Abstract
Abstract A polyimide optical waveguide comprising a core made of polyimide whose refractive index is controlled to a predetermined value by electron beam irradiation, and a cladding set in contact with the core and having a refractive index lower than that of the core.
Inventors
- 👤 Yasuko Maruo
- 👤 Shigekuni Sasaki
- 👤 Toshiaki Tamamura
- 👤 Tohru Matsuura
- 👤 Shinji Ando
- 👤 Shinsuke Matsui
- 👤 Fumio Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:20
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/13; G02B6/136; G02B1/00; G02B1/04; G02B1/045; G02B1/046; G02B6/122; G02B6/1221; G02B6/132
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A polyimide optical waveguide comprising: (a) a first one-layer cladding made of a first polyimide film; and (b) a core produced by irradiating a portion of said first polyimide film of said first one-layer cladding with an electron beam to provide a predetermined value of a refractive index of said irradiated portion, said first one-layer cladding having a refractive index lower than that of said core; and said first one-layer cladding and said core forming an embedded channel waveguide.
Claim 2
Dependent Claim
79 words
A polyimide optical waveguide comprising: (a) a first one-layer cladding made of a first polyimide film; and (b) a core produced by irradiating a portion of said first polyimide film of said first one-layer cladding with an electron beam to provide a predetermined value of a refractive index of said irradiated portion, said first one-layer cladding having a refractive index lower than that of said core; and said first one-layer cladding and said core forming an embedded channel waveguide.
Claim 3
Dependent Claim
51 words
The polyimide optical waveguide according to claim 1, further comprising: a second one-layer cladding made of a second polyimide film, said second one-layer cladding being disposed on said first one-layer cladding and said core; and said first one-layer cladding, said core and said second one-layer cladding forming an embedded channel waveguide.
Claim 4
Dependent Claim
50 words
The polyimide optical waveguide according to claim 1, wherein the first polyimide film consists essentially of a polyimide formed from (i) a tetracarboxylic compound selected from the group consisting of a tetracarboxylic acid, a tetracarboxylic acid anhydride, a tetracarboxylic acid chloride and a tetracarboxylic acid ester, and (ii) a diamine.
Claim 5
Dependent Claim
19 words
The polyimide optical waveguide according to claim 1, wherein the first polyimide film consists essentially of a fluorinated polyimide.
Claim 6
Dependent Claim
31 words
The polyimide optical waveguide according to claim 1, wherein the first polyimide film consists essentially of a polyimide obtained from a reaction mixture consisting essentially of 2,2-bis(3,4-dicarboxyphenyl)-hexafluoropropane dianhydride, 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and N,N-dimethylacetamide.
Claim 7
Dependent Claim
23 words
The polyimide optical waveguide according to claim 2, wherein the second polyimide film has a higher refracture index than the first polyimide film.
References Cited (Backward Citations)
US4808285A
Cited
GB2191603A
Cited
JPH0372528A
Cited
US5098804A
Cited
US5108201A
Cited
JPH049807A
Cited
JPH048734A
Cited
JPH04226549A
Cited
JPH04235505A
Cited
JPH04235506A
Cited
EP0525606A1
Cited
US5202938A
Cited
US5317082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-05 | 2008-05-06 | 2008-11-05 | $7700.00 | Window Closed / Lapsed |