US4982089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for obtaining the spectra of an unstable product
Assignee: United States Department of the Army
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Filing: 1990-02-28
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Granted: 1991-01-01
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Expires: 2010-02-28
Abstract
Abstract A method of obtaining the spectra of a product wherein the product is pas through a gas chromatograph in a stream of helium to separate the product into components, with the components then being passed through a spectrometer to obtain the spectra of the components. The components are chilled to a temperature below about minus 10 degrees Celsius and preferably below about minus 20 degrees Celsius to render the components stable and non-volatile.
Inventors
- 👤 Robert A. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:54
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/74; G01N30/26; G01N30/28; G01N30/30; G01N2030/3023; G01N30/60; G01N30/6004; G01N2030/6013; G01N2030/743
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A process for securing an infrared spectra of a volatile or unstable product, comprising a. passing the product in a gaseous form in a stream of helium through a gas chromatograph to separate different components of the product from each other, b. chilling the stream to a temperature to at least minus 10 degrees Celsius. c. passing the chilled stream through a Fourier transform infrared spectroscope to obtain the spectra of said components.
Claim 2
Dependent Claim
73 words
A process for securing an infrared spectra of a volatile or unstable product, comprising a. passing the product in a gaseous form in a stream of helium through a gas chromatograph to separate different components of the product from each other, b. chilling the stream to a temperature to at least minus 10 degrees Celsius. c. passing the chilled stream through a Fourier transform infrared spectroscope to obtain the spectra of said components.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the components are chilled to a temperature below about minus 20 degrees Celsius.
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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |