Patent US3968369A successfully refreshed from Google Patents.
US3968369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-dispersive infrared gas analysis device with triple layer receiver
Assignee: Bergwerksverband GmbH
•
Filing: 1974-11-15
•
Granted: 1976-07-06
•
Expires: 1994-11-15
Abstract
Abstract A radiation receiver including three receiver layers for infrared gas analysis. The first and third layers are connected in parallel, and their pressure is compared with that of the second or middle layer to derive a pressure difference which compensates for certain measurement problems found in prior art devices.
Inventors
- 👤 Karl Friedrich Luft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:06
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/37
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
Non-dispersive infrared gas analysis device for use with a set of incoming infra-red rays, comprising A. a radiation receiver divided into first, second, and third receiver layers arranged in series in the path of said rays, the first and third layers being outer layers and the second layer being a middle layer, and B. pneumatic parallel connection means for the first and the third layers, whereby a pressure difference occurs, due to radiation absorption, between the connected first and third layers at one pressure and the middle layer at another pressure, and C. means for measuring the pressure difference.
Claim 2
Dependent Claim
99 words
Non-dispersive infrared gas analysis device for use with a set of incoming infra-red rays, comprising A. a radiation receiver divided into first, second, and third receiver layers arranged in series in the path of said rays, the first and third layers being outer layers and the second layer being a middle layer, and B. pneumatic parallel connection means for the first and the third layers, whereby a pressure difference occurs, due to radiation absorption, between the connected first and third layers at one pressure and the middle layer at another pressure, and C. means for measuring the pressure difference.
Claim 3
Dependent Claim
15 words
A device according to claim 1 wherein the means for measuring is a diaphragm capacitor.
Claim 4
Dependent Claim
34 words
A device according to claim 1, wherein the third receiver layer has a rear wall formed by a radio-transparent window through which a second set of infra-red rays is likewise fed to the receiver.
Claim 5
Dependent Claim
12 words
A device according to claim 1 wherein each layer comprises a chamber.
Claim 6
Dependent Claim
168 words
Non-dispersive infrared gas analysis device for use with incoming rays comprising: A. at least one radiation source for infrared rays, B. at least one rotating shutter for modulation of the infrared rays, C. at least one vessel for a gas mixture to be tested, the vessel being situated in the path of the modulated incoming infrared rays, D. a radiation receiver divided into first, second, and third receiver layers arranged in series in the path of said rays through the vessel, the layers being separated by radio-transparent windows for the admittance and exit of the rays, the first and third layers being outer layers and the second layer being a middle layer, the third layer having a rear wall opposite the admittance window, E. pneumatic parallel connection means for the first and third layers, whereby a pressure difference occurs, due to radiation absorption, between the connected first and third layers at one pressure and the middle layer at another pressure, and F. means for measuring the pressure difference.
Claim 7
Dependent Claim
168 words
Non-dispersive infrared gas analysis device for use with incoming rays comprising: A. at least one radiation source for infrared rays, B. at least one rotating shutter for modulation of the infrared rays, C. at least one vessel for a gas mixture to be tested, the vessel being situated in the path of the modulated incoming infrared rays, D. a radiation receiver divided into first, second, and third receiver layers arranged in series in the path of said rays through the vessel, the layers being separated by radio-transparent windows for the admittance and exit of the rays, the first and third layers being outer layers and the second layer being a middle layer, the third layer having a rear wall opposite the admittance window, E. pneumatic parallel connection means for the first and third layers, whereby a pressure difference occurs, due to radiation absorption, between the connected first and third layers at one pressure and the middle layer at another pressure, and F. means for measuring the pressure difference.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |