US4131427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatography detector
Assignee: Individual
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Filing: 1978-02-13
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Granted: 1978-12-26
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Expires: 1998-02-13
Abstract
Abstract A means for detecting the presence of a solute in a flowing fluid stream is disclosed within. The schlieren patterns obtained when a solute present in a flowing fluid stream is directed into a reference fluid stream are utilized to scatter a portion of a light beam. The scattered light is detected and is related to the presence and amount of solute.
Inventors
- 👤 Stewart Karp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:26
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N30/00; G01N30/02; G01N30/62; G01N30/74; Y; Y10; Y10S; Y10S436/00; Y10S436/909
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A method for detecting and determining the quantity of a solute present in the carrier stream which emerges from a chromatographic column which comrises: directing said carrier stream into a mixing cell in which said carrier stream mixes with a reference stream thereby causing the appearance of schlieren when said solute is present in said carrier stream; directing a light beam through said cell to detect the schlieren, thereby causing the change of direction of some portion of said light beam when said solute is present in said carrier stream; and detecting some or all of said light which had changed direction.
Claim 2
Independent Claim
102 words
A method for detecting and determining the quantity of a solute present in the carrier stream which emerges from a chromatographic column which comrises: directing said carrier stream into a mixing cell in which said carrier stream mixes with a reference stream thereby causing the appearance of schlieren when said solute is present in said carrier stream; directing a light beam through said cell to detect the schlieren, thereby causing the change of direction of some portion of said light beam when said solute is present in said carrier stream; and detecting some or all of said light which had changed direction.
Claim 3
Independent Claim
111 words
An apparatus for detecting and determining the quantity of a solute present in the carrier stream which emerges from a chromatographic column which comprises; a means for directing said carrier stream into a mixing cell in which said carrier stream mixes with a reference stream thereby causing the appearance of schlieren when said solute is present in said carrier stream; a means for directing a light beam through said cell to detect said schlieren, thereby causing the change of direction of some position of said light beam when said solute is present in said carrier stream; and a means for detecting some or all of said light which had changed direction.
Claim 4
Independent Claim
111 words
An apparatus for detecting and determining the quantity of a solute present in the carrier stream which emerges from a chromatographic column which comprises; a means for directing said carrier stream into a mixing cell in which said carrier stream mixes with a reference stream thereby causing the appearance of schlieren when said solute is present in said carrier stream; a means for directing a light beam through said cell to detect said schlieren, thereby causing the change of direction of some position of said light beam when said solute is present in said carrier stream; and a means for detecting some or all of said light which had changed direction.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |