US4566791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid sample cell comprising Fresnel sectors
Assignee: NIR INSTRUMENTS COMPANY A CORP OF
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Filing: 1983-10-31
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Granted: 1986-01-28
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Expires: 2003-10-31
Abstract
Abstract A fluid sample cell for spectroscopic analysis of a fluid sample includes a fluid-tight compartment for the containment of a fluid sample which is defined by a radiant energy transmissive top, a side wall and a bottom. The bottom comprises a plurality of sectors and a Fresnel disc, whereby radiant energy passing through the compartment impinges upon at least one of the sectors and is specularly reflected from a reflecting surface of the sectors to respective focal points of the sectors.
Inventors
- 👤 Herbert Goldsmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:52
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A fluid sample cell for the spectroscopic analysis of a fluid sample comprising a fluid-tight compartment for the containment of a fluid sample, said compartment being defined by a radiant energy transmissive top, a side wall and a bottom, wherein said bottom comprises a plurality of sectors of a Fresnel disc, whereby radiant energy passing through said compartment impinges upon at least one of said sectors and is specularly reflected from a reflecting surface of said sectors to respective focal points of said sectors.
Claim 2
Dependent Claim
84 words
A fluid sample cell for the spectroscopic analysis of a fluid sample comprising a fluid-tight compartment for the containment of a fluid sample, said compartment being defined by a radiant energy transmissive top, a side wall and a bottom, wherein said bottom comprises a plurality of sectors of a Fresnel disc, whereby radiant energy passing through said compartment impinges upon at least one of said sectors and is specularly reflected from a reflecting surface of said sectors to respective focal points of said sectors.
Claim 3
Dependent Claim
16 words
The sample cell according to claim 1, wherein said reflecting surface is adjacent to said compartment.
Claim 4
Dependent Claim
37 words
The sample cell according to claim 1, wherein said bottom further comprises a radiant energy transmissive member, wherein one surface of said member is adjacent to said compartment and another surface is adjacent to said reflecting surface.
Claim 5
Dependent Claim
35 words
The sample cell according to claim 1, wherein said bottom comprises a radiant energy transmissive member having a flat surface which is adjacent to said compartment and a bottom surface which comprises said reflecting surface.
Claim 6
Dependent Claim
21 words
The sample cell according to claim 1, wherein there are four of said sectors and four of said respective focal points.
Claim 7
Dependent Claim
23 words
The sample cell according to claim 1, wherein there are at least three of said sectors and three of said respective focal points.
Claim 8
Dependent Claim
42 words
The sample cell according to claim 1, wherein radiant energy which is reflected to said focal points comprises substantially all of the radiant energy which is transmitted by a radiant energy source and which is not deflected or absorbed by said sample.
Claim 9
Dependent Claim
21 words
The sample cell according to claim 1, wherein the incident path of said radiant energy is perpendicular to said reflecting surface.
Claim 10
Dependent Claim
37 words
An apparatus for spectroscopic analysis comprising the sample cell according to claim 1, a radiant energy generator disposed above said transmissive top, and a plurality of detectors, a detector being positioned at each of said focal points.
Claim 11
Dependent Claim
21 words
The sample cell according to claim 1, wherein said sectors are derived from an outer annular portion of said Fresnel disc.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |