Russian translation: срок уплаты пошлины за поддержание патента в силе
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English to Russian translations [PRO] Law/Patents - Patents / характеристики систем патентного поиска
English term or phrase:maintenance due date
The results are displayed either in “basic results” or “main results” view, with publication number and invention title and hyperlink to the patent document specification in the first case and application/publication/DP publication number, applicant/proprietor name, title, status, maintenance due date and specification link in the second case.
Подозреваю, что речь о дате подачи (принятия) заявки.