Patent US818012A successfully refreshed from Google Patents.
Patent US3754654A successfully refreshed from Google Patents.
US3754654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for applying a liquid along a line on a support
Assignee: INSTRUMENTA AB
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Filing: 1971-04-07
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Granted: 1973-08-28
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Expires: 1991-04-07
Abstract
Abstract Apparatus for linear application of a liquid along the surface of a plate utilized in conjunction with chromatographic investigations includes a pipette arranged to be moved back and forth along the plate. The pipette is mounted pivotally in order that a capillary liquid application prong thereon can be maintained in contact with the surface of the plate when moving in one direction while it is raised from the surface when the pipette is moved in the opposite direction.
Inventors
- 👤 E Nybom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:58
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/2813; G01N30/00; G01N30/90; G01N30/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
184 words
A device for applying a liquid linearly onto a carrier means comprising a carriage, means for moving said carriage reciprocally and for supporting said carriage over and in parallel relation to the carrier means, a pipette means including a cylindrical receptacle and a capillary prong extending therefrom at an angle to the axis thereof for applying a dose of the liquid linearly onto the carrier means, a support for said pipette means mounted on said carriage for pivotal movement about an axis transverse to the path of movement of said carriage, and means at opposed ends of the path of movement of said carriage for reciprocally pivoting said support, whereby said pivotable support for said pipette means maintains said capillary prong obliquely downwards onto the carrier means at an acute angle thereto and backwards to the direction of movement over said carrier means while linearly applying liquid thereonto and maintains said capillary prong obliquely upwards away from the carrier means when the direction of movement is opposite to the first mentioned direction of movement to prevent flow of the liquid onto the carrier means.
Claim 2
Independent Claim
184 words
A device for applying a liquid linearly onto a carrier means comprising a carriage, means for moving said carriage reciprocally and for supporting said carriage over and in parallel relation to the carrier means, a pipette means including a cylindrical receptacle and a capillary prong extending therefrom at an angle to the axis thereof for applying a dose of the liquid linearly onto the carrier means, a support for said pipette means mounted on said carriage for pivotal movement about an axis transverse to the path of movement of said carriage, and means at opposed ends of the path of movement of said carriage for reciprocally pivoting said support, whereby said pivotable support for said pipette means maintains said capillary prong obliquely downwards onto the carrier means at an acute angle thereto and backwards to the direction of movement over said carrier means while linearly applying liquid thereonto and maintains said capillary prong obliquely upwards away from the carrier means when the direction of movement is opposite to the first mentioned direction of movement to prevent flow of the liquid onto the carrier means.
Claim 3
Dependent Claim
83 words
A device as claimed in claim 1 wherein said support for said pipette means comprises a shaft rotatably mounted on said carriage and wherein said means for pivoting said support comprises separate means for rotating said shaft in opposite directions at each end of the path of reciprocal movement so as to raise said capillary prong away from the carrier means at one end of the path and to lower said prong onto the carrier means at the other end of the path.
Claim 4
Dependent Claim
122 words
A device as claimed in claim 2 wherein one means for rotating said shaft to lower said pipette means comprises a first operating arm extending radially from said shaft, a magnet movably mounted on said carriage and in magnetic contact with said first operating arm, a fixed metal contact at one end of the path of movement, said magnet and said metal contact being attracted to each other at the one end of the path whereby upon reversal of movement of said carriage at the one end of the path, said metal contact will restrain said magnet and operating arm for sufficient time to cause said operating arm to rotate said shaft and thus lower said pipette means onto the carrier means.
Claim 5
Dependent Claim
83 words
A device as claimed in claim 3 wherein the other means for rotating Said shaft to raise said pipette means comprises a second operating arm extending radially from said shaft, a fixed projection at the other end of the path of movement, whereby when said second operating arm strikes said projection said operating arm rotates said shaft to raise said pipette means away from the carrier means and also rotates the first operating arm to move said movable magnet to its initial position.
Claim 6
Dependent Claim
38 words
A device as claimed in claim 2 and further comprising means for pivotally mounting said support on said shaft and for permitting fine angular adjustment of said support and said pipette means in relation to the carrier means.
Claim 7
Dependent Claim
29 words
A device as claimed in claim 5 and further comprising means for locking said shaft in a fixed position while making said fine angular adjustment of said pipette means.
Claim 8
Dependent Claim
32 words
A device as claimed in claim 4 and further comprising means for increasing frictional resistance to accidental rotation of said shaft after said pipette means has been positioned by said separate means.
References Cited (Backward Citations)
GB1032096A
Cited
US3635345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |