Carl Icahn and Darwin Deason, who own 15 percent of Xerox, have been trying to unravel the deal and unlock more value out the company. Asserting the Fujifilm deal values Xerox at just $28 per share, they said this week they would consider an all-cash bid of at least $40 per share.

Analysts say the prolonged fight for Xerox could ultimately push higher any offer price from Fujifilm or other interested parties. Buyout firm Apollo Global Management LLC considered a bid for Xerox last week, sources have said.

Fujifilm said on Thursday it has not yet received a new proposal from Xerox and believes the current deal provides the best value for the shareholders of both firms.

"If we receive a new proposal, we will need to study whether it offers value to the shareholders of Fujifilm," it said in a statement.

The two companies in January agreed to a complex $6.1 billion deal that would merge Xerox into their Asia joint venture Fuji Xerox, which Fujifilm would control with a 50.1 percent stake. Xerox shareholders were also due to receive a $2.5 billion special cash dividend.

The firms have not, however, disclosed a per share valuation for Xerox for the deal.

UBS analysts estimated in February that the deal valued Xerox at $40 a share - $9.80 in cash for every Xerox share held and calculated the stake in the proposed new Fuji Xerox to be worth $30. That value mostly matches the current demands of the activist shareholders, except they want it all in cash.

Shannon Cross from Cross Research said an incremental five dollars plus benefit from synergies from the Fuji-Xerox deal should result over time in a value for Xerox stock that would be above the $40 per share.

"At the end of the day, Carl Icahn has always wanted more money for this deal, I am not sure that running the business is what he looks to do," said Cross.

While some Tokyo-based analysts say Fujifilm would be better off putting its money into its non-copier and printer businesses, others argue that the Japanese firm, which relies on the joint venture for nearly half of its revenue, should cede to the activist shareholders' demands.

Xerox had at one stage reopened talks on the deal with Fujifilm but those discussions were suspended after Deason won a temporary court order blocking the deal. The judge said, however, that Xerox was not prohibited from exploring other transactions with Fujifilm.

Xerox said on Wednesday that it will pursue an appeal of the lower court's ruling in the Deason lawsuit, which it believes "was wrongly decided and will be reversed".

Fujifilm is also pursuing an appeal.

Shares of Xerox closed 1.6 percent higher at $28.96 on Wednesday. Fujfilm's shares were flat in Thursday afternoon trade.

(Reporting by Sonam Rai and Arjun Panchadar in Bengaluru; additional reporting by Makiko Yamazaki in Tokyo; Editing by Bernard Orr and Edwina Gibbs)

By Sonam Rai and Arjun Panchadar