The Maine Attorney General’s Office has asked for more time to respond to recent filings by attorneys for Anthony H. Sanborn Jr., who last week submitted new allegations and information in advance of an Oct. 10 hearing to examine whether Sanborn’s conviction for the 1989 murder of Jessica L. Briggs should be overturned. It is unclear whether the state’s request will affect the start of the hearing, which is expected to last for several days in Cumberland County Unified Court.