US4991973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic balance with scale on top
Assignee: Sartorius AG
•
Filing: 1989-05-30
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Granted: 1991-02-12
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Expires: 2009-05-30
Abstract
Abstract An electronic balance with scale on top having a drive means for a magnetic agitator which integral onto the balance scale. This enables the work steps of agitating and weighing to be performed simultaneously and by the same device.
Inventors
- 👤 Gunther Maaz
- 👤 Klaus Dardat
- 👤 Alfred Klauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:41
CPC Classifications
G; G01; G01G; G01G21/00; G01G21/22; B; B01; B01F; B01F33/00; B01F33/45; B01F33/452; G01G7/00; G01G7/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
An electronic balance having a magnetically driven agitator comprising: weighing scale on top of said electronic balance, magnetic shield means positioned on said weighing scale, drive means for the magnetically driven agitator positioned on said magnetic shield means and having a plurality of coils fastened to the weighing scale adapted and constructed to generate a magnetic rotary field. said magnetic shield means being of a dimensional size whereby to magnetically isolate said electronic balance from said drive means for said magnetically driven agitator, said weighing scale having a plurality of first support points terminating in first electrically conducting means, said first electrically conducting means being electrically connected to said coils, said electronic balance having a plurality of second support points terminating in second electrically conducting means adapted and constructed to be in abutting electrical communication with said first support point and to support said weighing scale, and a source of alternating electric current connected to said second electrically conducting means.
Claim 2
Dependent Claim
160 words
An electronic balance having a magnetically driven agitator comprising: weighing scale on top of said electronic balance, magnetic shield means positioned on said weighing scale, drive means for the magnetically driven agitator positioned on said magnetic shield means and having a plurality of coils fastened to the weighing scale adapted and constructed to generate a magnetic rotary field. said magnetic shield means being of a dimensional size whereby to magnetically isolate said electronic balance from said drive means for said magnetically driven agitator, said weighing scale having a plurality of first support points terminating in first electrically conducting means, said first electrically conducting means being electrically connected to said coils, said electronic balance having a plurality of second support points terminating in second electrically conducting means adapted and constructed to be in abutting electrical communication with said first support point and to support said weighing scale, and a source of alternating electric current connected to said second electrically conducting means.
Claim 3
Dependent Claim
153 words
An electronic balance having a magnetically driven agitator comprising: weighing scale of said electronic scale, magnetic shield means positioned on said weighing scale, drive means for the magnetically driven agitator positioned on said magnetic shield means and having a plurality of coils adapted and constructed to generate a magnetic rotary field, said magnetic shield means being of a dimensional size whereby to magnetically isolate said electronic balance form said drive means for said magnetically driven agitator, said weighing scale having a plurality of first support points terminating in first electrically conducting means, said first electrically conducting means being electrically connected to said coils, said electronic balance having a plurality of second support points terminating in second electrically conducting means adapted and constructed to be in abutting electrical communication with said first support points and to support said weighing scale, and a source of alternating electric current connected to said second electrically conducting means.
Claim 4
Dependent Claim
153 words
An electronic balance having a magnetically driven agitator comprising: weighing scale of said electronic scale, magnetic shield means positioned on said weighing scale, drive means for the magnetically driven agitator positioned on said magnetic shield means and having a plurality of coils adapted and constructed to generate a magnetic rotary field, said magnetic shield means being of a dimensional size whereby to magnetically isolate said electronic balance form said drive means for said magnetically driven agitator, said weighing scale having a plurality of first support points terminating in first electrically conducting means, said first electrically conducting means being electrically connected to said coils, said electronic balance having a plurality of second support points terminating in second electrically conducting means adapted and constructed to be in abutting electrical communication with said first support points and to support said weighing scale, and a source of alternating electric current connected to said second electrically conducting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |