Patent US4988482A successfully refreshed from Google Patents.
US4988482A
Expired / Lapsed
US
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Method and apparatus for chemical analysis
Assignee: Microvol Ltd
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Filing: 1987-10-05
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Granted: 1991-01-29
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Expires: 2007-10-05
Abstract
Abstract Apparatus for performing chemical analysis wherein a cuvette holds a sample under examination and a support carries a dispenser head carrying two one-shot dispensers each in the form of a pressurized container holding a liquid reagent, of which a metered does is delivered into the cuvette through a discharge tube fixed to the dispenser head when the body of the container is displaced relative to said discharge tube.
Inventors
- 👤 Terence E. Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:36
CPC Classifications
G; G01; G01N; G01N35/00; G01N35/10; B; B01; B01L; B01L3/00; B01L3/02; B01L3/0289; B01L3/0293
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
Apparatus for performing chemical analysis comprising in combination: sample holding means to hold a sample to be analyzed, a 1 shot metering dispenser having a reagent reservoir constantly pressurized by a gas also within said reservoir and a reagent discharge tube, support means supporting the dispenser in a manner allowing relative movement between the reservoir and the discharge tube, whereby liquid released by the dispenser is delivered to the sample holding means when the latter is in a predetermined position, and means for detecting a change in a predetermined property of a sample, wherein the reservoir and discharge tube are relatively moveable with unidirectional operating and return strokes to deliver a predetermined amount of reagent from said reservoir to the sample holding means as a result of each operating stroke.
Claim 2
Dependent Claim
130 words
Apparatus for performing chemical analysis comprising in combination: sample holding means to hold a sample to be analyzed, a 1 shot metering dispenser having a reagent reservoir constantly pressurized by a gas also within said reservoir and a reagent discharge tube, support means supporting the dispenser in a manner allowing relative movement between the reservoir and the discharge tube, whereby liquid released by the dispenser is delivered to the sample holding means when the latter is in a predetermined position, and means for detecting a change in a predetermined property of a sample, wherein the reservoir and discharge tube are relatively moveable with unidirectional operating and return strokes to deliver a predetermined amount of reagent from said reservoir to the sample holding means as a result of each operating stroke.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1, further comprising means movably supporting the sample holding means to enable the holding means to be moved to a predetermined position.
Claim 4
Dependent Claim
34 words
Apparatus according to claim 1, in which the discharge tube contains a conduit having an outlet disposed adjacent and above the sample holding means in the said predetermined position of said sample holding means.
Claim 5
Dependent Claim
38 words
Apparatus according to claim 1, further comprising a storage device for a plurality of said dispensers, whereby a selected dispenser may be brought to the support means for dispensing the liquid contained therein into a sample holding means.
Claim 6
Dependent Claim
20 words
Apparatus according to claim 1 in which the dispenser comprises a container containing an inert gas which pressurizes the container.
Claim 7
Dependent Claim
15 words
Apparatus according to claim 5, in which the gas is one of nitrogen and argon.
Claim 8
Dependent Claim
31 words
Apparatus according to claim 1, in which the means for detecting a change in a predetermined property of the sample is a photodetector which detects an optical property of the sample.
Claim 9
Dependent Claim
18 words
Apparatus according to claim 7 in which said photodetector includes means for detecting the color of the sample.
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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) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |