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(12) Patent: | (11) CA 2205995 |
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(54) English Title: | METHOD FOR SEPARATING GASEOUS POLLUTANTS FROM HOT PROCESS GASES |
(54) French Title: | TECHNIQUE DE SEPARATION DES POLLUANTS GAZEUX DES GAZ CHAUDS DE PROCESSUS DE FABRICATION |
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: | 2006-03-14 |
(86) PCT Filing Date: | 1995-11-24 |
(87) Open to Public Inspection: | 1996-06-06 |
Examination requested: | 2002-09-23 |
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/SE1995/001403 |
(87) International Publication Number: | SE1995001403 |
(85) National Entry: | 1997-05-23 |
(30) Application Priority Data: | ||||||
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Hot process gases are passed through a contact reactor (10), in which a
particulate absorbent material, which is reactive with gaseous
pollutants in the gases, is introduced into the gases to convert the gaseous
pollutants into separable dust. The process gases are then passed
through a dust separator (5). The major part of the dust separated in the dust
separator (5) is passed to a mixer (11), in which it is mixed
and moistened, whereupon it is recirculated as absorbent material by being
introduced, together with fresh absorbent, into the process gases.
Burnt lime is added as fresh absorbent. The dust is kept so long in the mixer
and recirculated so many times that the total residence time
of the burnt lime in the mixer in moistened state is sufficiently long for the
burnt lime to react substantially completely with water supplied
to the mixer and form slaked lime.
Les gaz chauds de processus de fabrication passent par un four de contact (10) dans lequel des particules absorbantes, qui réagissent avec les polluants gazeux contenus dans les gaz de fabrication, sont introduites dans ces gaz pour transformer les gaz polluants en poussière séparable. Les gaz de fabrication passent ensuite par un séparateur de poussière (5). La plus grande partie de la poussière séparée dans le séparateur (5) passe alors dans un mélangeur (11), où elle est mélangée et humidifiée avant d'être recyclée comme matière absorbante par introduction dans les gaz de fabrication en même temps qu'un absorbant frais. L'absorbant frais ajouté est de la chaux vive. La poussière reste si longtemps dans le mélangeur et elle est recyclée tellement de fois que la durée de séjour de la chaux vive à l'état humide dans le mélangeur suffit à ce que celle-ci réagisse de façon assez complète avec l'eau alimentant le mélangeur pour se transformer en chaux éteinte.
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.
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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Time Limit for Reversal Expired | 2010-11-24 |
Letter Sent | 2009-11-24 |
Grant by Issuance | 2006-03-14 |
Inactive: Cover page published | 2006-03-13 |
Inactive: Final fee received | 2005-12-14 |
Pre-grant | 2005-12-14 |
Notice of Allowance is Issued | 2005-07-14 |
Letter Sent | 2005-07-14 |
4 | 2005-07-14 |
Notice of Allowance is Issued | 2005-07-14 |
Inactive: Approved for allowance (AFA) | 2005-06-03 |
Amendment Received - Voluntary Amendment | 2005-04-19 |
Inactive: S.30(2) Rules - Examiner requisition | 2004-10-19 |
Inactive: S.29 Rules - Examiner requisition | 2004-10-19 |
Letter Sent | 2002-10-31 |
Request for Examination Requirements Determined Compliant | 2002-09-23 |
All Requirements for Examination Determined Compliant | 2002-09-23 |
Request for Examination Received | 2002-09-23 |
Letter Sent | 1997-11-07 |
Inactive: Single transfer | 1997-09-08 |
Inactive: IPC assigned | 1997-08-15 |
Inactive: First IPC assigned | 1997-08-13 |
Classification Modified | 1997-08-13 |
Inactive: IPC assigned | 1997-08-13 |
Inactive: IPC assigned | 1997-08-13 |
Inactive: Courtesy letter - Evidence | 1997-08-05 |
Inactive: Notice - National entry - No RFE | 1997-07-31 |
Application Received - PCT | 1997-07-29 |
Application Published (Open to Public Inspection) | 1996-06-06 |
There is no abandonment history.
The last payment was received on 2005-09-21
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 - standard | 1997-05-23 | ||
Registration of a document | 1997-05-23 | ||
MF (application, 2nd anniv.) - standard | 02 | 1997-11-24 | 1997-10-16 |
MF (application, 3rd anniv.) - standard | 03 | 1998-11-24 | 1998-10-16 |
MF (application, 4th anniv.) - standard | 04 | 1999-11-24 | 1999-10-20 |
MF (application, 5th anniv.) - standard | 05 | 2000-11-24 | 2000-10-20 |
MF (application, 6th anniv.) - standard | 06 | 2001-11-26 | 2001-10-23 |
Request for examination - standard | 2002-09-23 | ||
MF (application, 7th anniv.) - standard | 07 | 2002-11-25 | 2002-10-23 |
MF (application, 8th anniv.) - standard | 08 | 2003-11-24 | 2003-10-23 |
MF (application, 9th anniv.) - standard | 09 | 2004-11-24 | 2004-10-21 |
MF (application, 10th anniv.) - standard | 10 | 2005-11-24 | 2005-09-21 |
Final fee - standard | 2005-12-14 | ||
MF (patent, 11th anniv.) - standard | 2006-11-24 | 2006-09-27 | |
MF (patent, 12th anniv.) - standard | 2007-11-26 | 2007-10-09 | |
MF (patent, 13th anniv.) - standard | 2008-11-24 | 2008-10-09 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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ABB FLAKT AB |
Past Owners on Record |
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NILS BRINGFORS |
STEFAN AHMAN |