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Any discrepancies in the text and image of the Claims and Abstract are due to differing posting times. Text of the Claims and Abstract are posted:
(12) Patent: | (11) CA 2322407 |
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(54) English Title: | CURVED-BEAM PUMPING UNIT |
(54) French Title: | UNITE DE POMPAGE A BALANCIER COURBE |
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: | RICHES, MCKENZIE & HERBERT LLP |
(74) Associate agent: | |
(45) Issued: | 2005-02-01 |
(22) Filed Date: | 2000-10-05 |
(41) Open to Public Inspection: | 2001-04-13 |
Examination requested: | 2001-12-14 |
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: | ||||||
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A curved-beam pumping unit is provided, in which a support and a speed reducer are both affixed to a base, a beam seat is mounted on an upper end of the support, and a coupler assembly is connected at one end to a crossbeam fixed on a walking beam and connected at the other end to a crank which connecting the speed reducer with a crank balance, characterized in that the rear end of the walking beam is formed as curved shape and having a balance weight mounted on its tail part.
Unité de pompage à balancier incurvé, comprenant un support et un réducteur de vitesse fixés à une base, une assise de poutre est montée à l'une des extrémités supérieures du support, et un système de coupleur est relié à une extrémité de la traverse et fixé au balancier, et relié à une manivelle à l'autre extrémité, reliant le réducteur de vitesse au poids d'équilibrage de la manivelle, caractérisé par le fait que l'extrémité arrière du balancier est incurvée et que son contrepoids se trouve au niveau de la queue.
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.
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Description | Date |
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Inactive: Expired (new Act pat) | 2020-10-05 |
Common Representative Appointed | 2019-10-30 |
Common Representative Appointed | 2019-10-30 |
Maintenance Request Received | 2014-09-29 |
Maintenance Request Received | 2013-07-30 |
Grant by Issuance | 2005-02-01 |
Inactive: Cover page published | 2005-01-31 |
Pre-grant | 2004-11-12 |
Inactive: Final fee received | 2004-11-12 |
Notice of Allowance is Issued | 2004-10-06 |
Letter Sent | 2004-10-06 |
Notice of Allowance is Issued | 2004-10-06 |
Inactive: Approved for allowance (AFA) | 2004-09-07 |
Amendment Received - Voluntary Amendment | 2004-06-10 |
Inactive: S.30(2) Rules - Examiner requisition | 2004-05-05 |
Inactive: First IPC assigned | 2004-04-02 |
Letter Sent | 2002-02-06 |
Letter Sent | 2002-01-31 |
Inactive: Single transfer | 2001-12-21 |
Request for Examination Received | 2001-12-14 |
Request for Examination Requirements Determined Compliant | 2001-12-14 |
All Requirements for Examination Determined Compliant | 2001-12-14 |
Application Published (Open to Public Inspection) | 2001-04-13 |
Inactive: Cover page published | 2001-04-12 |
Inactive: First IPC assigned | 2000-12-15 |
Inactive: Courtesy letter - Evidence | 2000-11-21 |
Inactive: Filing certificate - No RFE (English) | 2000-11-14 |
Filing Requirements Determined Compliant | 2000-11-14 |
Application Received - Regular National | 2000-11-10 |
There is no abandonment history.
The last payment was received on 2004-08-09
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
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Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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CHINA NATIONAL PETROLEUM CORPORATION |
Past Owners on Record |
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DONG GUO |
JINYANG SU |
XUEMING BAI |
ZIZHONG ZHANG |