US3088716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic stirrers
Assignee: National Research Development Corp UK
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Filing: 1961-05-01
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Granted: 1963-05-07
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Stott Frank Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
F; F27; F27D; F27D27/00; B; B01; B01F; B01F33/00; B01F33/45; B01F33/452; G; G01; G01N; G01N35/00; G01N35/02; G01N35/021; F27D3/00; F27D2003/0034; F27D2003/0039; G01N2035/00465; G01N2035/00524; G01N35/04; G01N2035/0401; G01N2035/0406; G01N2035/0408
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A STIRRER FOR STIRRING LIQUIDS IN GENERALLY FLAT-BOTTOMED CONTAINERS COMPRISING A STIRRING ELEMENT OF MAGNETIC MATERIAL SHAPED SO AS TO BY DYNAMICALLY EQUIVALENT TO A WIDE-ANGLED CONE RESTING ON THE CONTAINER BOTTOM ALONG A GENERATRIX OF THE CONICAL SURFACE AND FREE TO ROLL ON SAID BOTTOM WITH THE CONICAL WALL OF SAID CONE ALWAYS IN CONTACT WITH THE BOTTOM, AND A ROTARY MAGNETIC FIELD SYSTEM ACTING ON SAID STIRRING ELEMENT, THE AXIS OF ROTATION OF SAID FIELD SYSTEM BEING SUBSTANTIALLY NORMAL TO THE PLANE TANGENTIAL TO SAID CONICAL SURFACE AND CONTAINING SAID GENERATRIX.
Claim 2
Dependent Claim
93 words
A STIRRER FOR STIRRING LIQUIDS IN GENERALLY FLAT-BOTTOMED CONTAINERS COMPRISING A STIRRING ELEMENT OF MAGNETIC MATERIAL SHAPED SO AS TO BY DYNAMICALLY EQUIVALENT TO A WIDE-ANGLED CONE RESTING ON THE CONTAINER BOTTOM ALONG A GENERATRIX OF THE CONICAL SURFACE AND FREE TO ROLL ON SAID BOTTOM WITH THE CONICAL WALL OF SAID CONE ALWAYS IN CONTACT WITH THE BOTTOM, AND A ROTARY MAGNETIC FIELD SYSTEM ACTING ON SAID STIRRING ELEMENT, THE AXIS OF ROTATION OF SAID FIELD SYSTEM BEING SUBSTANTIALLY NORMAL TO THE PLANE TANGENTIAL TO SAID CONICAL SURFACE AND CONTAINING SAID GENERATRIX.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-06 | 1966-11-05 | 1967-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-06 | 1970-11-05 | 1971-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-06 | 1974-11-05 | 1975-05-07 | $7700.00 | Window Closed / Lapsed |