US3745810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the rate at which vapors are evolved from materials during thermal degradation
Assignee: United States Department of Commerce
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Filing: 1971-09-03
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Granted: 1973-07-17
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Expires: 1991-09-03
Abstract
Abstract A sample of the material to be analyzed is placed in a tube of inert material. A source of pressurized inert carrier gas is connected to one end of the tube and a mass flow rate meter is connected to the other end. The sample is heated by a furnace and its temperature is measured. A cracking coil operated at orange heat in the tube between the sample and the meter cracks any condensable or tarry vapors evolved from the sample. This prevents any vapors that otherwise might condense in conduit lines from fouling the apparatus, and from failing to be included in measurements of the vapor mass flow rate.
Inventors
- 👤 Carter R Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:04
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14; G01N1/00; G01N1/02; G01N1/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
Apparatus for measuring the rate at which vapors are evolved from materials undergoing thermal degradation, comprising: a tube of inert material for holding a sample of the selected material, a source of pressurized inert gas connected to one end of said tube, means for measuring the mass flow rate of vapors evolved from said sample during heating thereof connected to the other end of said tube, a furnace adjacent said tube for heating said sample, means introduced into said tube for measuring the temperature of said sample, and a cracking coil in said tube between said sample and said other end thereof, for cracking condensable or tarry vapors evolved from said sample, to prevent them from erroneously reducing the reading of said vapor mass flow rate measuring means and from fouling the apparatus.
Claim 2
Dependent Claim
133 words
Apparatus for measuring the rate at which vapors are evolved from materials undergoing thermal degradation, comprising: a tube of inert material for holding a sample of the selected material, a source of pressurized inert gas connected to one end of said tube, means for measuring the mass flow rate of vapors evolved from said sample during heating thereof connected to the other end of said tube, a furnace adjacent said tube for heating said sample, means introduced into said tube for measuring the temperature of said sample, and a cracking coil in said tube between said sample and said other end thereof, for cracking condensable or tarry vapors evolved from said sample, to prevent them from erroneously reducing the reading of said vapor mass flow rate measuring means and from fouling the apparatus.
Claim 3
Dependent Claim
47 words
Apparatus as set forth in claim 1, wherein the bore of said tube between said sample and cracking coil is reduced in cross-section, to reduce vapor transit time, thermally isolate the sample from the cracking coil, and assist in loading and retaining the sample in said tube.
Claim 4
Dependent Claim
31 words
Apparatus as set forth in claim 1, wherein said cracking coil comprises a coil of electrical resistance heating wire wound on a tube of refractory material and operated at orange heat.
Claim 5
Dependent Claim
19 words
Apparatus as set forth in claim 1, wherein said furnace is tubular and surrounds said sample in said tube.
Claim 6
Dependent Claim
15 words
Apparatus as set forth in claim 1, wherein the temperature of said furnace is adjustable.
Claim 7
Dependent Claim
15 words
Apparatus as set forth in claim 1, wherein said temperature measuring means comprises a thermocouple.
Claim 8
Dependent Claim
28 words
Apparatus as set forth in claim 1, wherein means are provided for recording the outputs of said vapor mass flow rate measuring means and said temperature measuring means.
Claim 9
Dependent Claim
16 words
Apparatus as set forth in claim 7, wherein said recording means comprises a two-channel potentiometric recorder.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |