US4077002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for NMR sample tube vortex plug
Assignee: Varian Medical Systems Inc
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Filing: 1976-11-22
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Granted: 1978-02-28
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Expires: 1996-11-22
Abstract
Abstract A vortex restraining plug for an NMR spinning sample tube which floats partially submerged in the sample and which restrains vortexing.
Inventors
- 👤 Barbara L. Erwine
- 👤 Stephen H. Smallcombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:08
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30; G01R33/307
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
Method for conserving sample materials necessary for high resolution NMR spectroscopy comprising the steps of: inserting a liquid including a sample for analysis in a substantially right, circular cylindrically shaped NMR sample tube; inserting into said sample tube an inert body floatable on said liquid, said body having a substantially circular cross-section of less diameter than said tube; inserting said tube including said liquid and floating body into an NMR spinner apparatus; spinning said tube at high speed in a high magnetic field, whereby said body restricts the formation of a vortex on the surface of said liquid in said tube.
Claim 2
Dependent Claim
101 words
Method for conserving sample materials necessary for high resolution NMR spectroscopy comprising the steps of: inserting a liquid including a sample for analysis in a substantially right, circular cylindrically shaped NMR sample tube; inserting into said sample tube an inert body floatable on said liquid, said body having a substantially circular cross-section of less diameter than said tube; inserting said tube including said liquid and floating body into an NMR spinner apparatus; spinning said tube at high speed in a high magnetic field, whereby said body restricts the formation of a vortex on the surface of said liquid in said tube.
Claim 3
Independent Claim
66 words
A method of using a freely floating body having a circular cross-section of lesser diameter than an NMR sample tube configured to float in the liquid in said tube to restrict the height of a vortex of a liquid sample in a spinning NMR sample tube comprising the steps of: inserting said body into said sample tube with said sample liquid and spinning said sample tube.
Claim 4
Independent Claim
66 words
A method of using a freely floating body having a circular cross-section of lesser diameter than an NMR sample tube configured to float in the liquid in said tube to restrict the height of a vortex of a liquid sample in a spinning NMR sample tube comprising the steps of: inserting said body into said sample tube with said sample liquid and spinning said sample tube.
Claim 5
Dependent Claim
55 words
Spinning sample apparatus comprising: a sample tube for receiving a sample liquid means for spinning said sample tube at high speeds about the axis of said tube, means in said tube for floating on said liquid to impose a vertical constraint on the formation of a vortex in said liquid when the tube is spinning.
Claim 6
Dependent Claim
55 words
Spinning sample apparatus comprising: a sample tube for receiving a sample liquid means for spinning said sample tube at high speeds about the axis of said tube, means in said tube for floating on said liquid to impose a vertical constraint on the formation of a vortex in said liquid when the tube is spinning.
Claim 7
Dependent Claim
50 words
An improved NMR vortex restraining plug for an NMR spinning sample tube comprising: a body of inert material, said body having a circular cross section and an outside diameter less than 30 mm, said body being configured to float on a liquid having a specific gravity between 0.78 and 1.6.
Claim 8
Dependent Claim
50 words
An improved NMR vortex restraining plug for an NMR spinning sample tube comprising: a body of inert material, said body having a circular cross section and an outside diameter less than 30 mm, said body being configured to float on a liquid having a specific gravity between 0.78 and 1.6.
Claim 9
Dependent Claim
14 words
The plug of claim 4 wherein said body has a hollowed out interior cavity.
Claim 10
Dependent Claim
36 words
The plug of claim 4 wherein said body includes a top, a bottom and side walls having at least one air passage therein which air passage extends from said top to said bottom of said body.
Claim 11
Dependent Claim
17 words
The plug of claim 6 including means accessible on said top surface for attaching a removal device.
Claim 12
Dependent Claim
11 words
The plugof claim 6 wherein said body is made of glass.
Claim 13
Dependent Claim
12 words
The plug of claim 6 wherein said body is made from polyfluorocarbon.
Claim 14
Dependent Claim
22 words
The plug of claim 6 wherein said body is made of materials selected from the group consisting of glass, polyfluorocarbon, or plastics.
References Cited (Backward Citations)
US3091732A
Cited
US3911355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |