US3975946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid chromatography sample measuring and introducing apparatus
Assignee: Micromeritics Instrument Corp
•
Filing: 1974-12-17
•
Granted: 1976-08-24
•
Expires: 1994-12-17
Abstract
Abstract Sample introduction apparatus useful in liquid chromatography and including a valve body having at least one fluid passage of precisely defined volume to receive a sample material and having another fluid passage delivering carrier liquid to a liquid chromatograph. The valve body can be manipulated to place the precisely defined volume in the chromatograph fluid circuit, so that the sample contained within the volume is positively displaced into the chromatograph.
Inventors
- 👤 Dean M. Ball
- 👤 Ronnie W. Camp
- 👤 Warren P. Hendrix
- 👤 Clyde Orr, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:23
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16; G01N30/20; G01N30/26; G01N30/28; G01N30/36; G01N30/32; G01N2030/326; G01N30/38; G01N30/44; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86509; Y10T137/86517; Y10T137/86533
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
Apparatus for measuring a certain volume of material and selectively introducing the measured volume into a fluid stream, comprising: a valve body; a valve member selectively movably received in said valve body, said valve member having a first fluid flow passage therein; said first fluid flow passage having a precisely defined volume equal to the certain volume to be measured; a first fluid flow circuit in said valve body; a second fluid flow passage in said valve member; a second fluid flow circuit in said valve body; said second fluid flow passage being located in said valve member to be in fluid flow alignment with said second flow circuit when said valve member is positioned in the sample measuring position placing said first fluid flow passage in said first fluid flow circuit; means selectively positioning said valve member either to a sample measuring position placing said fluid flow passage in said first fluid flow circuit, or to a sample introduction position placing said fluid flow passage in said second flow circuit; a third fluid flow passage located in said valve body to be in fluid flow alignment with an inlet portion of said second fluid flow circuit and with a bypass output line in said valve body, in response to selective rotation of said valve member to a bypass position; and means on said valve member interrupting said second fluid flow circuit when said valve body is in said bypass position.
Claim 2
Dependent Claim
241 words
Apparatus for measuring a certain volume of material and selectively introducing the measured volume into a fluid stream, comprising: a valve body; a valve member selectively movably received in said valve body, said valve member having a first fluid flow passage therein; said first fluid flow passage having a precisely defined volume equal to the certain volume to be measured; a first fluid flow circuit in said valve body; a second fluid flow passage in said valve member; a second fluid flow circuit in said valve body; said second fluid flow passage being located in said valve member to be in fluid flow alignment with said second flow circuit when said valve member is positioned in the sample measuring position placing said first fluid flow passage in said first fluid flow circuit; means selectively positioning said valve member either to a sample measuring position placing said fluid flow passage in said first fluid flow circuit, or to a sample introduction position placing said fluid flow passage in said second flow circuit; a third fluid flow passage located in said valve body to be in fluid flow alignment with an inlet portion of said second fluid flow circuit and with a bypass output line in said valve body, in response to selective rotation of said valve member to a bypass position; and means on said valve member interrupting said second fluid flow circuit when said valve body is in said bypass position.
Claim 3
Dependent Claim
78 words
Apparatus as in claim 1, wherein: said valve member comprises a rotor received for selective rotation within said valve body; said fluid flow passages extend in a generally axial direction through said rotor in angularly spaced apart relation thereon; and said first and second fluid flow circuits are interrupted by said rotor at locations thereon which enable said fluid flow passages to be placed in said measuring position and said introduction position by selective rotation of said rotor.
Claim 4
Dependent Claim
131 words
Apparatus as in claim 2, wherein: said rotor has a pair of spaced apart faces and each of said fluid flow passages extends in communication with each said face; said valve body has a rotor receptacle including a pair of spaced apart confronting faces which sealingly confront said rotor faces; said first flow circuit includes an inlet opening in one of said confronting faces and an outlet opening in the other of said confronting faces; said second flow circuit includes a first opening in said one confronting face and a second opening in said other confronting face; and said inlet and outlet openings of each said flow circuit being located for selective fluid flow alignment with either of said fluid flow passages in response to said selective rotation of said rotor.
Claim 5
Dependent Claim
74 words
Apparatus as in claim 2, including at least one other fluid flow passage extending through said rotor, said other fluid flow passage having a precisely defined volume equal to another certain volume to be measured, and said other fluid flow passage is located on said rotor for alignment in said sample measuring position at the same time that one of the first and second fluid flow passages in aligned in said sample introduction position.
References Cited (Backward Citations)
US3071005A
Cited
FR1318788A
Cited
US3122168A
Cited
US3114393A
Cited
US3223123A
Cited
US3297053A
Cited
US3475950A
Cited
US3747630A
Cited
US3683701A
Cited
US3885439A
Cited
US3864978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |