US4804834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensor having photosensitive part formed of purple membrane
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1988-03-31
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Granted: 1989-02-14
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Expires: 2008-03-31
Abstract
Abstract A photosensor uses as a photosensitive part thereof a purple membrane film which contains bacteriorhodopsin isolated from a highly halophilic bacterium and which generates a photoelectromotive force corresponding to the intensity of light absorbed, and uses as an amplifying part an FET.
Inventors
- 👤 Tatsuo Katsura
- 👤 Hideatsu Maeda
- 👤 Tsukasa Sakai
- 👤 Keishiro Tsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:43
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/08; H03F3/082; B; B82; B82Y; B82Y10/00; C; C09; C09K; C09K9/00; C09K9/02; G; G01; G01J; G01J1/00; G01J1/42; H10; H10K; H10K30/00; H10K30/50; H10K85/00; H10K85/761; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/549
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A photosensor comprising: a photosensitive part including a transparent electrode, purple membrane containing bacteriorhodopsin which is isolated from a highly halophilic bacterium and having an ability to absorb light and generate photoelectromotive force corresponding to the intensity of the absorbed light, said purple membrane being electrodeposited on said transparent electrode to form a purple membrane film, and a second electrode deposited on a surface of said purple membrane film opposite the surface thereof facing said transparent electrode, means for intermittently projecting light to be measured on said purple membrane film, and a FET having a source and a gate which are connected respectively to said transparent electrode and said second electrode.
Claim 2
Dependent Claim
111 words
A photosensor comprising: a photosensitive part including a transparent electrode, purple membrane containing bacteriorhodopsin which is isolated from a highly halophilic bacterium and having an ability to absorb light and generate photoelectromotive force corresponding to the intensity of the absorbed light, said purple membrane being electrodeposited on said transparent electrode to form a purple membrane film, and a second electrode deposited on a surface of said purple membrane film opposite the surface thereof facing said transparent electrode, means for intermittently projecting light to be measured on said purple membrane film, and a FET having a source and a gate which are connected respectively to said transparent electrode and said second electrode.
Claim 3
Dependent Claim
13 words
A photosensor according to claim 1, wherein said FET is a MOS FET.
Claim 4
Dependent Claim
23 words
A photosensor according to claim 1, wherein said purple membrane film electrodeposited on said transparent electrode has a thickness of about 12 μm.
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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |