US3749369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic stirring element
Assignee: Bel Art Products Inc
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Filing: 1971-07-09
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Granted: 1973-07-31
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Expires: 1991-07-09
Abstract
Abstract A combination weighing and mixing device adapted for use as the mixing element of a magnetic stirring apparatus including a container and magnetic drive means for rotating the mixing element in the container, said device comprising a generally ellipsoidally-shaped housing, a magnetic element encapsulated in said housing and at least one cavity formed in said housing defining a measuring chamber for additives to be mixed with a liquid in the container.
Inventors
- 👤 K Landsberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:33
CPC Classifications
B; B01; B01F; B01F33/00; B01F33/45; B01F33/452
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A combination weighing and mixing device adapted for use as the mixing element of a magnetic stirring apparatus including a container and magnetic drive means for rotating the mixing element in the container, said device comprising a generally ellipsoidally-shaped housing, at least one cavity formed in said housing defining a measuring chamber for additives to be mixed with a liquid in the container, said housing including a flat base section formed in the housing diametrically opposed to the measuring chamber and parallel to the plane through the upper edge of the measuring chamber, and a magnetic element encapsulated in said housing.
Claim 2
Dependent Claim
101 words
A combination weighing and mixing device adapted for use as the mixing element of a magnetic stirring apparatus including a container and magnetic drive means for rotating the mixing element in the container, said device comprising a generally ellipsoidally-shaped housing, at least one cavity formed in said housing defining a measuring chamber for additives to be mixed with a liquid in the container, said housing including a flat base section formed in the housing diametrically opposed to the measuring chamber and parallel to the plane through the upper edge of the measuring chamber, and a magnetic element encapsulated in said housing.
Claim 3
Dependent Claim
17 words
The device as claimed in claim 1 wherein said housing is made of a low-friction inert material.
Claim 4
Dependent Claim
56 words
The device as claimed in claim 1 wherein the center of gravity is non-coincident with the geometric center so that the device spins about an axis parallel to said plane through the upper edge of the measuring chamber when subjected to a magnetic field in the container, due to the action of centrifugal force upon rotation.
Claim 5
Dependent Claim
93 words
The device as claimed in claim 1 wherein the magnetic element is symmetrical about the center of a truly ellipsoidally-shaped housing and wherein the volume of the measuring chamber cavity is greater than the volume enclosed between an arcuate trace of the housing adjacent the base and the base so that the center of gravity is displaced from a true geometric center whereby the spinning attitude is about an axis parallel to the said plane through the upper edge of the measuring chamber, due to the action of the centrifugal force upon rotation.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |