US3591289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atomic absorption sample cell
Assignee: Sprague Electric Co
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Filing: 1968-09-24
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Granted: 1971-07-06
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Expires: 1988-09-24
Abstract
Abstract The determination of minute amounts of specific constituents in a specimen is accomplished through atomic absorption analysis in a beam of radiated atomic spectral light. The specimen is in vaporized condition in a controlled atmosphere of a closed region and the beam is passed through the vapor so that selective absorption of the resonance lines of the beam takes place. The specific absorption is then suitably detected and measured.
Inventors
- 👤 Helen M Donega
- 👤 Thomas E Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/3103
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
In the method of claim 1 the step of introducing argon gas as the inert gas.
Claim 2
Dependent Claim
22 words
The method of claim 1 in which said ambient atmosphere is reduced to a pressure of no more than about 2 torr.
Claim 3
Dependent Claim
21 words
In the method of claim 1 the step of radiating the beam of atomic spectral light from a hollow cathode discharge.
Claim 4
Dependent Claim
140 words
In an apparatus for determining minute quantities of elements in a specimen substance, a chamber having a plurality of ports, means coupled to at least one of said ports for evacuating said chamber, means coupled to at least one of said ports for introducing a gas, a mount supporting a sample of the specimen substance in said chamber, means associated with said mount being capable of evaporating the sample by heating to a vapor in said chamber, an inert gas in said chamber providing an ambient atmosphere at less than atmospheric pressure which inert gas minimizes that chemical combination which decreases the number of ground-state atoms, means for projecting an atomic spectral light beam through said chamber, and mans for quantitatively determining the amount of the element in the specimen substance, said determining means including a monochromator and a photodetector.
Claim 5
Dependent Claim
34 words
In the apparatus as claimed in claim 5, said specimen-supporting mount consisting of an electrical resistance filament capable of being heated by the passage of current to vaporize the supported specimen in said chamber.
Claim 6
Dependent Claim
27 words
In the apparatus as claimed in claim 5, said specimen-supporting mount consisting of a boat capable of being heated to vaporize the supported specimen in said chamber.
Claim 7
Dependent Claim
24 words
In the apparatus as claimed in claim 5, said means for projecting an atomic spectral light beam consisting of a hollow cathode discharge lamp.
References Cited (Backward Citations)
US3188180A
Cited
US3469789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |