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(12) Patent: | (11) CA 2268878 |
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(54) English Title: | METHOD OF WORKING CONNECTION END OF DEFORMED BAR FOR REINFORCING CONCRETE, DEFORMED BAR WORKED BY THE METHOD AND STRUCTURE DEFORMED BAR |
(54) French Title: | METHODE DE RACCORDEMENT D'EXTREMITE DE BARRE DEFORMEE POUR ARMATURE DE BETON, METHODE DE TRAVAIL DE BARRE DEFORMEE ET BARRE STRUCTURALE DEFORMEE |
Status: | Term Expired - Post Grant Beyond Limit |
(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: | SMART & BIGGAR LP |
(74) Associate agent: | |
(45) Issued: | 2003-04-29 |
(22) Filed Date: | 1999-04-13 |
(41) Open to Public Inspection: | 2000-10-13 |
Examination requested: | 1999-04-13 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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With an object of providing a method of working a connection end portion of deformed bar for reinforcing concrete considerably reducing working expense by enhancing easiness of working by promoting mechanical strength of a connection portion by being able to work the connection portion without destructing a steel skeleton structure of a connection portion between pieces of steel bar, deformed bar worked by the method and a connection structure of deformed bar, the invention provides a method of working a connection end portion of deformed bar for reinforcing concrete featured in comprising a swaging step in which in deformed bar for reinforcing concrete featured in swaging at least a connection end portion at normal temperature and forming a rolled thread portion at an outer peripheral face of the connection end portion of the deformed bar subjected to the swaging step in which at least one connection end portion is swaged at a normal temperature such that a maximum diameter of the connection end portion is equal to or slightly larger than a diameter of a cylindrical body of the deformed bar or slightly smaller than a diameter of the deformed bar depending on a degree of working; and a rolling step of forming a thread portion having a diameter substantially equal to a swaging diameter at an outer peripheral face of the connection end portion of the deformed bar which has been subjected to the swaging step.
Linvention concerne un procédé de travail dune partie dextrémité de raccordement de barre déformée pour armer du béton réduisant considérablement la dépense de travail par lamélioration de la facilité de travail en favorisant la résistance mécanique dune partie de raccordement en étant capable de travailler la partie de raccordement sans détruire une structure darmature en acier dune partie de raccordement entre des pièces de barres en acier, une barre déformée travaillée par le procédé et une structure de raccordement de barre déformée, linvention prévoyant un procédé de travail dune extrémité de raccordement de barre déformée pour du béton de renforcement caractérisé en ce quil comprend une étape de rétreinte dans laquelle dans une barre déformée destinée à armer du béton, est caractérisée par la rétreinte dau moins une partie dextrémité de raccordement à une température normale et la formation dune partie de filet laminée au niveau dune face périphérique externe de lextrémité de raccordement de la barre déformée soumise à létape de rétreinte dans laquelle au moins une partie dextrémité de raccordement est rétreinte à une température normale de sorte quun diamètre maximal de la partie dextrémité de raccordement soit égal ou légèrement supérieur à un diamètre dun corps cylindrique de la barre déformée ou légèrement inférieur à un diamètre de la barre déformée en fonction dun degré de travail; et une étape de laminage consistant à former une partie de filet ayant un diamètre sensiblement égal à un diamètre de rétreinte dune face périphérique externe de la partie dextrémité de raccordement de la barre déformée qui a été soumise à létape de rétreinte.
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.
For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Event History , Maintenance Fee and Payment History should be consulted.
Description | Date |
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Inactive: Expired (new Act pat) | 2019-04-13 |
Change of Address or Method of Correspondence Request Received | 2018-01-12 |
Inactive: Office letter | 2013-12-27 |
Inactive: Reversal of will be deemed expired status | 2013-12-13 |
Inactive: Reversal of will be deemed expired status | 2013-12-13 |
Inactive: Reversal of will be deemed expired status | 2013-12-13 |
Inactive: Reversal of will be deemed expired status | 2013-12-13 |
Inactive: Reversal of will be deemed expired status | 2013-12-13 |
Inactive: Reversal of deemed expired status | 2013-12-06 |
Inactive: Correspondence - MF | 2013-11-05 |
Inactive: Agents merged | 2013-08-13 |
Inactive: Office letter | 2013-04-18 |
Maintenance Request Received | 2013-04-15 |
Inactive: Late MF processed | 2013-04-15 |
Letter Sent | 2013-04-15 |
Inactive: Office letter | 2012-04-30 |
Letter Sent | 2012-04-13 |
Inactive: Late MF processed | 2012-04-13 |
Inactive: Office letter | 2011-04-29 |
Inactive: Late MF processed | 2011-04-13 |
Letter Sent | 2011-04-13 |
Inactive: Late MF processed | 2010-04-13 |
Letter Sent | 2010-04-13 |
Inactive: Late MF processed | 2009-04-14 |
Inactive: Late MF processed | 2009-04-14 |
Letter Sent | 2009-04-14 |
Inactive: Late MF processed | 2009-04-13 |
Inactive: Late MF processed | 2009-04-13 |
Inactive: Late MF processed | 2009-04-13 |
Letter Sent | 2008-04-14 |
Time Limit for Reversal Expired | 2007-04-13 |
Letter Sent | 2006-04-13 |
Inactive: IPC from MCD | 2006-03-12 |
Inactive: IPC from MCD | 2006-03-12 |
Inactive: IPC from MCD | 2006-03-12 |
Grant by Issuance | 2003-04-29 |
Inactive: Cover page published | 2003-04-28 |
Pre-grant | 2003-02-06 |
Inactive: Final fee received | 2003-02-06 |
Notice of Allowance is Issued | 2002-08-09 |
Letter Sent | 2002-08-09 |
Notice of Allowance is Issued | 2002-08-09 |
Inactive: Approved for allowance (AFA) | 2002-08-01 |
Amendment Received - Voluntary Amendment | 2002-07-18 |
Letter Sent | 2002-05-30 |
Reinstatement Requirements Deemed Compliant for All Abandonment Reasons | 2002-05-17 |
Amendment Received - Voluntary Amendment | 2002-05-17 |
Reinstatement Request Received | 2002-05-17 |
Letter Sent | 2001-07-13 |
Reinstatement Requirements Deemed Compliant for All Abandonment Reasons | 2001-07-04 |
Inactive: Abandoned - No reply to s.30(2) Rules requisition | 2001-05-17 |
Deemed Abandoned - Failure to Respond to Maintenance Fee Notice | 2001-04-17 |
Inactive: S.30(2) Rules - Examiner requisition | 2000-11-17 |
Application Published (Open to Public Inspection) | 2000-10-13 |
Inactive: Cover page published | 2000-10-12 |
Inactive: First IPC assigned | 1999-06-08 |
Inactive: Filing certificate - RFE (English) | 1999-06-01 |
Letter Sent | 1999-06-01 |
Application Received - Regular National | 1999-05-14 |
Small Entity Declaration Determined Compliant | 1999-04-13 |
Request for Examination Requirements Determined Compliant | 1999-04-13 |
All Requirements for Examination Determined Compliant | 1999-04-13 |
Abandonment Date | Reason | Reinstatement Date |
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2002-05-17 | ||
2001-04-17 |
The last payment was received on 2003-02-06
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.
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Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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GYENG OK CHUNG |
CHUNG KI YOO |
Past Owners on Record |
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None |