Patent US4082950A successfully refreshed from Google Patents.
US4082950A
Expired / Lapsed
US
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Calibration assembly for infrared moisture analyzer
Assignee: Lorillard Inc
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Filing: 1977-02-10
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Granted: 1978-04-04
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Expires: 1997-02-10
Abstract
Abstract A calibration assembly for an infrared moisture analyzer used for measuring the moisture content of tobacco leaf is described. The assembly comprises a housing for a glass window etched on at least one face and a layer of a particulate material having average particle sizes of about 50-100 microns. The assembly is characterized as having a reflectance similar to that of tobacco.
Inventors
- 👤 Leighton L. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:01
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274; G01N21/278
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A calibration assembly for an infrared moisture analyzer for measuring the moisture content of tobacco leaf by reflection of infrared radiation which comprises: (a) a housing having means for mounting in the moisture analyzer; (b) a glass window which is transparent to infrared radiation, said window being etched on both faces and secured within the housing; (c) a layer of a particulate material contained within the housing beneath the window, said material having an average particle size in the range of about 50-100 microns; (d) means to retain the particulate material layer within the housing; and (e) said assembly having a reflectivity from the window thereof with respect to the infrared wavelengths employed in said analyzer comparable to the reflectivity of tobacco, and providing a predominantly diffuse reflection from the window.
Claim 2
Dependent Claim
131 words
A calibration assembly for an infrared moisture analyzer for measuring the moisture content of tobacco leaf by reflection of infrared radiation which comprises: (a) a housing having means for mounting in the moisture analyzer; (b) a glass window which is transparent to infrared radiation, said window being etched on both faces and secured within the housing; (c) a layer of a particulate material contained within the housing beneath the window, said material having an average particle size in the range of about 50-100 microns; (d) means to retain the particulate material layer within the housing; and (e) said assembly having a reflectivity from the window thereof with respect to the infrared wavelengths employed in said analyzer comparable to the reflectivity of tobacco, and providing a predominantly diffuse reflection from the window.
Claim 3
Dependent Claim
28 words
The assembly of claim 1 wherein the etched glass window is characterized by a surface roughness having dimensions substantially greater than the wavelength of the incident infrared radiation.
Claim 4
Dependent Claim
18 words
The assembly of claim 1 wherein the particulate material has an average particle size of about 50 microns.
Claim 5
Dependent Claim
14 words
The assembly of claim 1 wherein the particulate material is activated magnesium silicate gel.
Claim 6
Dependent Claim
13 words
The assembly of claim 1 wherein the particulate material is cross-linked dextran gel.
Claim 7
Dependent Claim
17 words
The assembly of claim 1 wherein the particulate material layer ranges in thickness from about 1-3 centimeters.
References Cited (Backward Citations)
US3205355A
Cited
US3478210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |