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(12) Patent: | (11) CA 2219503 |
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(54) English Title: | MAGNETOFLUID WITH HIGH SATURATION MAGNETISATION |
(54) French Title: | FLUIDES AIMANTES A AIMANTATION A SATURATION ELEVEE |
Status: | Expired and beyond the Period of Reversal |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | GOWLING WLG (CANADA) LLP |
(74) Associate agent: | |
(45) Issued: | 2001-04-24 |
(86) PCT Filing Date: | 1997-02-27 |
(87) Open to Public Inspection: | 1997-09-04 |
Examination requested: | 1997-10-27 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | Yes |
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(86) PCT Filing Number: | PCT/DE1997/000443 |
(87) International Publication Number: | DE1997000443 |
(85) National Entry: | 1997-10-27 |
(30) Application Priority Data: | |||||||||
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It has been the task of the invention to form a magnetofluid with a high
saturation magnetisation which has a saturation concentration that lies
above 100 mT in order to be able to transmit higher forces.
According to the invention, this is attained by stably dispersing cobalt and
nanometer particles modified with mono-molecular adsorption layers in
carrier liquids, whereby the volume concentration of the ferromagnetic
component comes to 5 to 35 per cent, preferably to 15 to 30 %, and the
volume concentration of the modified particles (naked particles with
adsorption shell) comes up to 50 per cent by volume.
L'invention vise à créer un fluide magnétique présentant une aimantation à saturation élevée, dont la concentration de saturation est supérieure à 100 mT afin de permettre le transfert de forces supérieures. A cet effet, on forme des dispersions stables de particules nanométriques et de cobalt modifiées par des couches d'adsorption monomoléculaires, dans des fluides de support, la concentration volumique des composants ferromagnétiques étant comprise entre 5 et 35 %, de préférence entre 15 et 30 %, et la concentration volumique des particules modifiées (particules nues avec enrobage d'adsorption) atteignant jusqu'à 50 % en volume.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 2219503 was not found.
2024-08-01:As part of the Next Generation Patents (NGP) transition, the Canadian Patents Database (CPD) now contains a more detailed Event History, which replicates the Event Log of our new back-office solution.
Please note that "Inactive:" events refers to events no longer in use in our new back-office solution.
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Description | Date |
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Inactive: IPC from MCD | 2006-03-12 |
Inactive: IPC from MCD | 2006-03-12 |
Inactive: IPC from MCD | 2006-03-12 |
Time Limit for Reversal Expired | 2003-02-27 |
Letter Sent | 2002-02-27 |
Grant by Issuance | 2001-04-24 |
Inactive: Cover page published | 2001-04-23 |
Inactive: Entity size changed | 2001-02-14 |
Pre-grant | 2001-01-25 |
Inactive: Final fee received | 2001-01-25 |
Notice of Allowance is Issued | 2000-11-29 |
Letter Sent | 2000-11-29 |
4 | 2000-11-29 |
Notice of Allowance is Issued | 2000-11-29 |
Inactive: Applicant deleted | 2000-11-27 |
Inactive: Approved for allowance (AFA) | 2000-11-15 |
Amendment Received - Voluntary Amendment | 2000-06-12 |
Inactive: S.30(2) Rules - Examiner requisition | 1999-12-13 |
Amendment Received - Voluntary Amendment | 1999-03-01 |
Classification Modified | 1998-02-09 |
Inactive: First IPC assigned | 1998-02-09 |
Inactive: IPC assigned | 1998-02-09 |
Inactive: Acknowledgment of national entry - RFE | 1998-01-26 |
Inactive: Applicant deleted | 1998-01-22 |
Inactive: Inventor deleted | 1998-01-22 |
Application Received - PCT | 1998-01-21 |
All Requirements for Examination Determined Compliant | 1997-10-27 |
Request for Examination Requirements Determined Compliant | 1997-10-27 |
Application Published (Open to Public Inspection) | 1997-09-04 |
There is no abandonment history.
The last payment was received on 2000-12-18
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
Patent fees are adjusted on the 1st of January every year. The amounts above are the current amounts if received by December 31 of the current year.
Please refer to the CIPO
Patent Fees
web page to see all current fee amounts.
Fee Type | Anniversary Year | Due Date | Paid Date |
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Basic national fee - small | 1997-10-27 | ||
Request for examination - small | 1997-10-27 | ||
MF (application, 2nd anniv.) - small | 02 | 1999-03-01 | 1999-02-17 |
MF (application, 3rd anniv.) - small | 03 | 2000-02-28 | 2000-01-19 |
MF (application, 4th anniv.) - small | 04 | 2001-02-27 | 2000-12-18 |
Final fee - standard | 2001-01-25 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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HANNS-DIETRICH STAHLMANN |
THOMAS HAHNDEL |
ARNIM NETHE |
JOHANNES MULLER |
NORBERT BUSKE |
ARMIN REHFELD |
Past Owners on Record |
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None |