US3842680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas blast wiping collar for cleaning pipettes
Assignee: Bach Simpson Ltd
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Filing: 1972-08-09
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Granted: 1974-10-22
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Expires: 1992-08-09
Abstract
Abstract A system for cleaning a pipette includes a gas dispensing means attached to the pipette and defining an orifice for directing gas onto the pipette surface. By controlling the application of gas through the dispensing means, the pipette surface can be maintained free of liquid thereby avoiding inaccurate testing while also avoiding possible contamination of the pipette.
Inventors
- 👤 C Vollick
- 👤 S Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; G; G01; G01N; G01N35/00; G01N35/10; G01N35/1004
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
In a pipette construction wherein the pipette is immersed in a liquid during use, the improvement in means for cleaning the pipette comprising a gas dispensing means attached to the pipette, means for supplying gas to said dispensing means, said dispensing means comprising a member attached to the body of the pipette in a position spaced from the end of the pipette through which liquid passes into and out of the pipette, said member comprising a first tubular portion defining a central passage approximating the exterior configuration of said pipette, said first tubular portion being attached onto said pipette for maintaining the tubular portion in spaced relationship relative to the end of the pipette, and a second tubular portion threaded onto said first tubular portion thereby forming an orifice surrounding the pipette body and opening in a direction toward said end of the pipette, and including means for adjusting the size of said orifice, said orifice being defined between the tubular portions and being adjustable upon relative rotation of the tubular portions, and operation of said dispensing means applying a gas stream through the orifice to the exterior surface of said pipette thereby removing liquid particles from the pipette surface.
Claim 2
Dependent Claim
200 words
In a pipette construction wherein the pipette is immersed in a liquid during use, the improvement in means for cleaning the pipette comprising a gas dispensing means attached to the pipette, means for supplying gas to said dispensing means, said dispensing means comprising a member attached to the body of the pipette in a position spaced from the end of the pipette through which liquid passes into and out of the pipette, said member comprising a first tubular portion defining a central passage approximating the exterior configuration of said pipette, said first tubular portion being attached onto said pipette for maintaining the tubular portion in spaced relationship relative to the end of the pipette, and a second tubular portion threaded onto said first tubular portion thereby forming an orifice surrounding the pipette body and opening in a direction toward said end of the pipette, and including means for adjusting the size of said orifice, said orifice being defined between the tubular portions and being adjustable upon relative rotation of the tubular portions, and operation of said dispensing means applying a gas stream through the orifice to the exterior surface of said pipette thereby removing liquid particles from the pipette surface.
Claim 3
Dependent Claim
44 words
A construction in accordance with claim 1 wherein said end of the pipette comprises a small diameter portion with the pipette body tapering outwardly away from said end to a juncture with a large diameter portion which comprises said exterior configuration of the pipette.
Claim 4
Dependent Claim
28 words
A construction in accordance with claim 1 wherein said gas comprises air, and means connected to said gas supplying means for intermittently supplying air to said dispensing means.
Claim 5
Dependent Claim
38 words
A construction in accordance with claim 1 wherein the means for supplying gas to said dispensing means comprise an air tube connected to said dispensing means, said air tube directing air radially inwardly toward said first tubular portion.
Claim 6
Dependent Claim
33 words
A construction in accordance with claim 1 wherein the means for supplying gas to said dispensing means comprise an air tube, said tube directing gas tangentially relative to the axis of said pipette.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |