US3584957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for infrared spectroscopy
Assignee: Barnes Engineering Co
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Filing: 1970-01-26
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Granted: 1971-06-15
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Expires: 1990-01-26
Abstract
Abstract A process and apparatus for obtaining nongaseous pyrolyzate samples of materials for infrared analysis is described. The collecting devices or cells for nongaseous pyrolyzates which at ordinary temperature may be liquid or partially solid are provided with a heat ribbon having a depression to take the pyrolysis sample and a cover with a hermetically sealable opening taking a pyrolyzate plate which may be an attenuated total reflection plate, one side being exposed to the pyrolysis vapors on the inside and the other coolable. The heater is connectable to a power source and the cell to a source of vacuum with a valve which can be shut after pyrolysis is complete to maintain the vacuum.
Inventors
- 👤 Stanley E Polchlopek
- 👤 Robert L Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:50
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55; G01N21/552; G01N21/01; G01N21/03; G01N21/25; G01N21/31; G01N21/35; G01N1/00; G01N1/02; G01N1/22; G01N21/3577
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A process of infrared spectral analysis of nongaseous phase pyrolyzates comprising, in combination, a. heating at subatmospheric pressure a substance capable of pyrolysis to form vapors condensable to the nongaseous phase and relatively nonvolatile at room temperature, the heating being to a temperature sufficiently high to pyrolyze the material at the subatmospheric pressure to produce pyrolysis vapors, b. exposing one side of an infrared transmitting plate to the pyrolysis vapors, and maintaining the other side of the plate out of contact with the pyrolysis vapors, c. cooling said other side of the plate to a temperature at which condensable pyrolysis vapors condense to the nongaseous stage, whereby a layer of the nongaseous pyrolyzate is formed on said one side of the plate, and d. analyzing the pyrolyzate layer on the plate by infrared spectral analysis.
Claim 2
Dependent Claim
135 words
A process of infrared spectral analysis of nongaseous phase pyrolyzates comprising, in combination, a. heating at subatmospheric pressure a substance capable of pyrolysis to form vapors condensable to the nongaseous phase and relatively nonvolatile at room temperature, the heating being to a temperature sufficiently high to pyrolyze the material at the subatmospheric pressure to produce pyrolysis vapors, b. exposing one side of an infrared transmitting plate to the pyrolysis vapors, and maintaining the other side of the plate out of contact with the pyrolysis vapors, c. cooling said other side of the plate to a temperature at which condensable pyrolysis vapors condense to the nongaseous stage, whereby a layer of the nongaseous pyrolyzate is formed on said one side of the plate, and d. analyzing the pyrolyzate layer on the plate by infrared spectral analysis.
Claim 3
Dependent Claim
26 words
A process according to claim 1 in which the plate is an ATR substrate and wherein the step of analyzing comprises analysis by attenuated total techniques.
References Cited (Backward Citations)
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US2237238A
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US2809315A
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US2818831A
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US3302609A
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |