US4688935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma spectroscopic analysis of organometallic compounds
Assignee: ATK Launch Systems LLC
•
Filing: 1983-06-24
•
Granted: 1987-08-25
•
Expires: 2003-06-24
Abstract
Abstract A method of analysing a volatile, air or moisture sensitive or pyrophoric, liquid organometallic compound for an impurity, comprises the steps of: A. decomposing a sample of the compound by dropwise addition of the sample into frozen aqueous acid; B. deluting the composed sample with water; and C. analysing the diluted, decomposed sample by plasma spectroscopy. This method is particularly suitable for measuring non-volatile impurities.
Inventors
- 👤 Ramon M. Barnes
- 👤 Istvan Bertenyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:10
CPC Classifications
G; G01; G01N; G01N31/00; G01N21/00; G01N21/62; G01N21/71; G01N21/73; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25625
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
A method of analyzing a volatile, air or moisture sensitive, or pyrophoric, liquid organometallic sample for an impurity, comprising the steps of: A. providing (a) an exponential dilution flask comprising liquid sample receiving means, (b) a source of carrier gas selectively communicating with or isolated from said exponential dilution flask, and (c) plasma spectroscopy analysis apparatus selectively communicating with or isolated from said exponential dilution flask; B. isolating said exponential dilution flask from said source of carrier gas, said spectroscopy apparatus and the environment external to the exponential dilution flask; C. while said exponential dilution flask is isolated, introducing a volatile, air or moisture sensitive, or pyrophoric, liquid, organometallic sample into said exponential dilution flask through said liquid sample receiving means; D. while said flask is isolated, evaporating substantially all the liquid sample within said exponential dilution flask, thereby forming a gaseous sample contained entirely within said exponential dilution flask; E. establishing communication between said source of carrier gas and said exponential dilution flask, and between said exponential dilution flask and said plasma spectroscopy analysis apparatus; and F. introducing a flow of carrier gas into said flask from said source of carrier gas, thereby sweeping the gaseous sample from said exponential dilution flask into said spectroscopy apparatus.
Claim 2
Independent Claim
207 words
A method of analyzing a volatile, air or moisture sensitive, or pyrophoric, liquid organometallic sample for an impurity, comprising the steps of: A. providing (a) an exponential dilution flask comprising liquid sample receiving means, (b) a source of carrier gas selectively communicating with or isolated from said exponential dilution flask, and (c) plasma spectroscopy analysis apparatus selectively communicating with or isolated from said exponential dilution flask; B. isolating said exponential dilution flask from said source of carrier gas, said spectroscopy apparatus and the environment external to the exponential dilution flask; C. while said exponential dilution flask is isolated, introducing a volatile, air or moisture sensitive, or pyrophoric, liquid, organometallic sample into said exponential dilution flask through said liquid sample receiving means; D. while said flask is isolated, evaporating substantially all the liquid sample within said exponential dilution flask, thereby forming a gaseous sample contained entirely within said exponential dilution flask; E. establishing communication between said source of carrier gas and said exponential dilution flask, and between said exponential dilution flask and said plasma spectroscopy analysis apparatus; and F. introducing a flow of carrier gas into said flask from said source of carrier gas, thereby sweeping the gaseous sample from said exponential dilution flask into said spectroscopy apparatus.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the impurity is a volatile silicon compound.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the liquid organometallic sample is trimethylgallium.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said plasma spectroscopy apparatus comprises an atomic emission spectroscopy apparatus.
Claim 6
Dependent Claim
14 words
The method of claim 1, wherein said liquid sample receiving means comprises a septum.
Claim 7
Dependent Claim
11 words
The method of claim 1, wherein said carrier gas is argon.
Claim 8
Dependent Claim
34 words
The method of claim 1, wherein an outlet valve is provided for selectively isolating said exponential dilution flask from said spectroscopy apparatus or establishing communication between said exponential dilution flask and said spectroscopy apparatus.
Claim 9
Dependent Claim
38 words
The method of claim 7, wherein an inlet valve is provided for selectively isolating said exponential dilution flask from said source of carrier gas or establishing communication between said exponential dilution flask and said source of carrier gas.
Claim 10
Dependent Claim
44 words
The method of claim 8, wherein said isolating step is executed by closing said inlet and outlet valves and wherein said step of establishing communication between said source of carrier gas and said exponential flask is executed by opening said inlet and outlet valves.
References Cited (Backward Citations)
US3922475A
Cited
US3824016A
Cited
US3888628A
Cited
US3911723A
Cited
US4259573A
Cited
US4300393A
Cited
US4334882A
Cited
US4454095A
Cited
JPH106443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |