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US4291985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual beam photometer with rotating filter plate
Assignee: NIPPON DENSHOKU KOGYO CO Ltd
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Filing: 1980-02-04
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Granted: 1981-09-29
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Expires: 2000-02-04
Abstract
Abstract A photometer comprising a light source, a rotating plate provided with a plurality of filter means having different wave lengths, a reference plate and a sample means, said rotating plate disposed between said light source and said reference plate and sample means, and a half-mirror and a reflection plate located between said light source and said rotating plate, said half-mirror and reflection plate being disposed so as to form a first light passage adapted to extend to the reference plate, and a second light passage adapted to extend to the sample means, whereby alternate radiation through one of said filter means against the reference plate and the sample means is made by the rotation of said rotary plate.
Inventors
- 👤 Masatoshi Tsujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:15
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/08; G01J3/0205; G01J3/0251; G01J3/46; G01J3/50; G01J3/501; G01J3/51; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A photometer comprising a light source, a rotating plate provided with a plurality of filter means having different wave lengths, a reference plate and a sample means, said rotating plate disposed between said light source and said reference plate and sample means, and a half-mirror and a reflection plate located between said light source and said rotating plate, said half-mirror and reflection plate being disposed so as to form a first light passage adapted to extend to the reference plate, and a second light passage adapted to extend to the sample means, whereby alternate radiation through one of said filter means against the reference plate and the sample means is made by the rotation of said rotary plate.
Claim 2
Dependent Claim
118 words
A photometer comprising a light source, a rotating plate provided with a plurality of filter means having different wave lengths, a reference plate and a sample means, said rotating plate disposed between said light source and said reference plate and sample means, and a half-mirror and a reflection plate located between said light source and said rotating plate, said half-mirror and reflection plate being disposed so as to form a first light passage adapted to extend to the reference plate, and a second light passage adapted to extend to the sample means, whereby alternate radiation through one of said filter means against the reference plate and the sample means is made by the rotation of said rotary plate.
Claim 3
Dependent Claim
19 words
The photometer of claim 1 wherein motor means is operatively connected with said rotating plate for rotating said plate.
Claim 4
Dependent Claim
25 words
The photometer of claim 1 wherein a light receiving element is operatively associated with said reference plate and said sample means for receiving light therefrom.
Claim 5
Dependent Claim
23 words
The photometer of claim 1 wherein the reflection plate, the sample means and the light receiving element are combined in a multiplication ball.
Claim 6
Dependent Claim
26 words
The photometer of claim 4 wherein an additional reflection plate is disposed near the multiplication ball for directing the second light passage to the sample means.
Claim 7
Dependent Claim
51 words
The photometer of claim 1 wherein the filter means are so disposed that both the first and second light passages can be simultaneously shielded from the reference plate and the sample means by the rotation of said rotating plate thereby performing a zero adjustment at every rotation of the rotating plate.
References Cited (Backward Citations)
US4029419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |