US3620628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric sample measuring apparatus
Assignee: Hitachi Ltd
•
Filing: 1969-04-30
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Granted: 1971-11-16
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Expires: 1989-04-30
Abstract
Abstract A system for analyzing the photometric properties of a sample of material, which comprises a means for projecting a light beam from a light source to a flame into which the sample to be analyzed and a reference material are alternately introduced, a detector for detecting the intensities of the sample beam and the reference beam which have been transmitted through the flame, and a means for comparing an electric signal indicative of the intensity of said sample beam obtained from said detector with the other electric signal indicative of the intensity of said reference beam.
Inventors
- 👤 Kazuo Yasuda
- 👤 Koichi Uchino
- 👤 Koji Nishiwaki
- 👤 Hiroshi Inomata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/3103
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A photoelectric sample measuring apparatus comprising means for automatically alternately and periodically introducing a sample material and a reference material on to a single optical axis, a photoelectric transducer positioned on said optical axis for converting light beams obtained respectively from said sample material and said reference material into corresponding electric signals, and means for comparing the electric signal indicative of said sample material with the electric signal indicative of said reference material in synchronization with the operation of said means for alternately and periodically introducing materials, wherein said means for automatically alternately and periodically introducing the sample material and the reference material on to the optical axis, includes means for providing a flame on said optical axis and automatic means for alternately and periodically introducing the sample material and the reference material into said flame, wherein said automatic means for alternately and periodically introducing said materials into the flame, includes means for alternately and periodically spraying said sample material and said reference material into said flame through separate spray jets, respectively.
Claim 2
Dependent Claim
172 words
A photoelectric sample measuring apparatus comprising means for automatically alternately and periodically introducing a sample material and a reference material on to a single optical axis, a photoelectric transducer positioned on said optical axis for converting light beams obtained respectively from said sample material and said reference material into corresponding electric signals, and means for comparing the electric signal indicative of said sample material with the electric signal indicative of said reference material in synchronization with the operation of said means for alternately and periodically introducing materials, wherein said means for automatically alternately and periodically introducing the sample material and the reference material on to the optical axis, includes means for providing a flame on said optical axis and automatic means for alternately and periodically introducing the sample material and the reference material into said flame, wherein said automatic means for alternately and periodically introducing said materials into the flame, includes means for alternately and periodically spraying said sample material and said reference material into said flame through separate spray jets, respectively.
Claim 3
Dependent Claim
103 words
A photoelectric sample measuring apparatus as defined in claim 1, wherein said means for alternately and periodically spraying said materials, includes a cylinder having first, second and third ports, said first port communicating with one of said spray jets, said second port communicating with the other spray jet and said third port communicating with a combustive gas supply; a plunger fitted in said cylinder, a space movable with said plunger being formed between said cylinder and said plunger; and means for moving said plunger reciprocatively so that said third port communicates alternately with said first port and said second port through said space.
Claim 4
Dependent Claim
44 words
A photoelectric sample measuring apparatus as defined in claim 2, wherein said means for moving said plunger reciprocatively, includes an eccentric cam engaging against one end of said plunger, a spring for urging said plunger to said cam, and means for driving said cam.
Claim 5
Dependent Claim
132 words
A photoelectric sample measuring apparatus as defined in claim 3, wherein said means for comparing said two electric signals includes means for alternately and periodically switching said electric signal indicative of the sample material and said electric signal indicative of the reference material, respectively, to a first electric system and a second electric system, said second electric system including means for feeding back said electric signal indicative of the reference material to said photoelectric transducer to vary the sensitivity thereof in a manner that the value of said feedback signal is maintained at a constant level while the ensuing signal indicative of the sample material is being generated from said transducer, and said first electric system including means for indicating the information of the sample material as compared with the reference material.
Claim 6
Dependent Claim
20 words
A photoelectric sample measuring apparatus as defined in claim 4, wherein said electric discharge lamp is a hollow cathode lamp.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |