Patent US4917776A successfully refreshed from Google Patents.
US4917776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow through voltammetric analyzer and method using deoxygenator
Assignee: Individual
•
Filing: 1989-02-09
•
Granted: 1990-04-17
•
Expires: 2009-02-09
Abstract
Abstract A flow through polarographic or other voltammetric analyzer utilizes an improved deoxygenator/pulse dampener in the form of a knitted or other form of convoluted oxygen permeable tubing, such as silicone rubber tubing, through which the flow sample passes. The oxygen permeable tubing is mounted in a chamber containing a flowing inert gas under a positive pressure.
Inventors
- 👤 Larry Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:36
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/48
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A flow through voltammetric analyzer, comprising: an electrochemical flow cell; a selector valve for selecting an analyte or electrolyte into a flow path; a pump for pumping fluid in the flow path; a deoxygenator in the flow path comprised of a length of convoluted oxygen permeable tubing contained in a container which is sealed except for an inlet and an outlet connection for said tubing and an inlet and an outlet for an inert gas substantially free of oxygen; and means for connecting said outlet connection for said tubing to said electrochemical flow cell.
Claim 2
Dependent Claim
94 words
A flow through voltammetric analyzer, comprising: an electrochemical flow cell; a selector valve for selecting an analyte or electrolyte into a flow path; a pump for pumping fluid in the flow path; a deoxygenator in the flow path comprised of a length of convoluted oxygen permeable tubing contained in a container which is sealed except for an inlet and an outlet connection for said tubing and an inlet and an outlet for an inert gas substantially free of oxygen; and means for connecting said outlet connection for said tubing to said electrochemical flow cell.
Claim 3
Dependent Claim
13 words
Apparatus in accordance with claim 1 wherein said pump is a peristaltic pump.
Claim 4
Dependent Claim
13 words
Apparatus in accordance with claim 1 wherein said pump is a reciprocating pump.
Claim 5
Dependent Claim
13 words
Apparatus in accordance with claim 1 wherein said pump is a syringe pump.
Claim 6
Dependent Claim
20 words
Apparatus in accordance with claim 1 wherein said tubing contains sufficient convolutions to dampen pump pulsations in the flow path.
Claim 7
Dependent Claim
22 words
Apparatus in accordance with claim 1 wherein said tubing of said deoxygenator is knitted and provides a dampening of the pump pulsations.
Claim 8
Dependent Claim
17 words
Apparatus in accordance with claim 1 wherein said oxygen permeable tubing is comprised of silicone rubber tubing.
Claim 9
Dependent Claim
13 words
Apparatus in accordance with claim 7 wherein said silicone rubber tubing is knitted.
Claim 10
Dependent Claim
31 words
Apparatus in accordance with claim 8 including an inert gas source for providing an inert gas wherein said inert gas is selected from the group consisting of nitrogen, helium and argon.
Claim 11
Dependent Claim
16 words
Apparatus in accordance with claim 1 wherein said voltammetric flow cell includes a dropping mercury electrode.
Claim 12
Dependent Claim
39 words
Apparatus in accordance with claim 1 wherein said oxygen permeable tubing is comprised of silicone rubber having a length of approximately ten feet with an inner diameter of approximately 0.015 inch and an outer diameter of approximately 0.0625 inch.
Claim 13
Dependent Claim
34 words
Apparatus in accordance with claim 1 wherein said length and the amount of convolution of said oxygen permeable tubing are selected such that pulsations in the samples caused substantially by said pump are dampened.
Claim 14
Dependent Claim
84 words
Apparatus for deoxygenation of samples to be analyzed in a flow through voltammetric analyzer, comprising: a length of convoluted oxygen permeable tubing through which the sample to be analyzed passes; and a container in which said oxygen permeable tubing is mounted, said container including an inert gas inlet adapted to be connected to a source of inert gas and an outlet for said inert gas, said inert gas flow through said container flushing oxygen out of said container as oxygen diffuses through said tubing.
Claim 15
Dependent Claim
84 words
Apparatus for deoxygenation of samples to be analyzed in a flow through voltammetric analyzer, comprising: a length of convoluted oxygen permeable tubing through which the sample to be analyzed passes; and a container in which said oxygen permeable tubing is mounted, said container including an inert gas inlet adapted to be connected to a source of inert gas and an outlet for said inert gas, said inert gas flow through said container flushing oxygen out of said container as oxygen diffuses through said tubing.
Claim 16
Dependent Claim
17 words
Apparatus in accordance with claim 13 wherein said oxygen permeable tubing is comprised of silicone rubber tubing.
Claim 17
Dependent Claim
39 words
Apparatus in accordance with claim 13 wherein said oxygen permeable tubing is comprised of silicone rubber tubing having a length of about ten feet, an inner diameter of approximately 0.015 inch and an outer diameter of approximately 0.0625 inch.
Claim 18
Dependent Claim
31 words
Apparatus in accordance with claim 13 including an inert gas source for providing an inert gas wherein said inert gas is selected from the group consisting of nitrogen, helium and argon.
Claim 19
Dependent Claim
39 words
Apparatus in accordance with claim 13 wherein said chamber is a sealed chamber having a removable top with an inlet and outlet connection for said convoluted oxygen permeable tubing and an inlet and outlet connection for said inert gas.
Claim 20
Independent Claim
60 words
A method of deoxygenation and pulse dampening in a flow through voltammetric analyzer, comprising the steps of: flowing sample to be analyzed through a length of convoluted oxygen permeable tubing contained in a substantially sealed container; and flowing an inert gas through said container wherein oxygen diffusing from the sample through said oxygen permeable tubing is flushed from said container.
Claim 21
Independent Claim
60 words
A method of deoxygenation and pulse dampening in a flow through voltammetric analyzer, comprising the steps of: flowing sample to be analyzed through a length of convoluted oxygen permeable tubing contained in a substantially sealed container; and flowing an inert gas through said container wherein oxygen diffusing from the sample through said oxygen permeable tubing is flushed from said container.
Claim 22
Dependent Claim
30 words
A method in accordance with claim 18 wherein said flowing of an inert gas through said container flows at a rate of between 100 to 300 cubic centimeters per minute.
References Cited (Backward Citations)
DE248192C
Cited
US3421989A
Cited
US3367858A
Cited
US3475310A
Cited
US3808116A
Cited
US3857088A
Cited
US3750460A
Cited
US4036704A
Cited
US4107020A
Cited
US4138322A
Cited
US4220515A
Cited
US4142944A
Cited
US4260467A
Cited
US4490234A
Cited
US4500411A
Cited
US4548679A
Cited
US4469495A
Cited
US4566949A
Cited
US4601792A
Cited
US4714527A
Cited
US4661210A
Cited
US4662996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |