Patent: If a maintenance fee is not

Patent: If a maintenance fee is not paid by the due date (the anniversary of the filing date), the Commissioner will send a Notice under the Patent Act requiring the patentee to pay the maintenance fee and the late fee before the later of two months of the date of the notice or six months from the maintenance fee due date. If the maintenance fee and the late fee are not paid within that time, the patent will be deemed expired at the maintenance fee due date.You can request reversal of the deemed expiry of the patent for the twelve month period that follows the six month period after the maintenance fee due date, by submitting:a request to reverse the deemed expiry of the patentPayment of the required maintenance fee,Payment of the late fee ($150),Payment of the additional fee ($200)The circumstances that led to the failure to pay the maintenance fee and the late fee within the prescribed timethe measures that the patentee took to avoid the failure ((including any remedial or alternative steps that were taken to avoid the failure);Any other justifications or evidence to support the above.In order for the patent application to be reinstated, the Commissioner must make a positive determination that due care had been taken. For more information, please see Chapter 27 of the Manual of Patent Office Practice.Note: You can find your payment history as well as the due dates for your next maintenance fee payments in the 'Admin Status' Tab in the Canadian Patents Database. We strongly recommend that you pay your maintenance fees a few days before the due date in order to ensure prompt payment. Time limits for the payment of maintenance fees cannot be extended.Please see Chapters 9 and 27 of the Manual of Patent Office Practice for examples of date calculations.