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* Apple asks appeals court to intervene in patent dispute

* Appeals judges suggest Apple needs more evidence

* Importance of “snap-back” feature in dispute

By David Ingram

WASHINGTON, April 6 (Reuters) – A U.S. appeals court on

Friday showed few signs that it was prepared to support a

request by Apple Inc to block immediately the sale of

some Samsung Electronics smartphones and tablets.

In a high-stakes patent dispute, the court heard arguments

about whether a federal trial judge acted correctly in December

when she ruled that Apple failed to provide enough evidence to

support an injunction of Samsung’s Galaxy product line.

The court’s judges reacted with skepticism to a premise put

forward by Apple’s lawyer that for the purpose of getting an

injunction, Apple does not need to show a causal link between

patent infringement and a loss of customers.

Apple’s lawyer, Michael Jacobs, said it is enough to show

that Samsung likely infringed on Apple patents used in products

such as the iPhone, and that Apple is likely to be hurt. The

trial judge found those things but not enough evidence of a

causal link.

Judge William Bryson on Friday asked about a hypothetical

case in which an automaker copied the design of a cupholder from

a second automaker. Under Apple’s argument, if the second

automaker later lost market share, it could ask for an

injunction against sales by the first automaker, Bryson said.

“Can that possibly be right?” he asked. Bryson is one of

three judges who heard the case before the U.S. Court of Appeals

for the Federal Circuit.

Judge Sharon Prost said some evidence of a link is

important. Harm such as lost customers, she said, “could have

been for reasons completely different from the infringement.”

The Apple-Samsung dispute is scheduled to go to trial in

July in federal court in California.

Apple, maker of the iPad and the iPhone, wants the immediate

injunction because even if it wins at trial, it might not see

the benefits of a verdict until late in 2012, Jacobs said.

An order to stop sales by South Korea-based Samsung would

have the potential to affect settlement considerations.

The two companies are fighting their legal battle worldwide,

filing complaints in at least 10 countries as they struggle for

market share in the tablet and smartphone markets.

POPULARITY OF ‘SNAP-BACK’

The appellate judges on Friday wrestled with what evidence

Apple would need to show that a competitor got ahead through

unauthorized use of a patented Apple feature. For example, would

it be enough for Apple to survey consumers about which features

are important to them? How many consumers would matter?

That kind of requirement would make it all but impossible

for a patent holder to win an injunction because it is difficult

to get inside a consumer’s mind, Jacobs said.

“We know it is a combination of elements that goes into any

purchasing decision,” Jacobs said.

One characteristic that the Apple and Samsung products share

is the “snap-back,” which affects how a user navigates the

touch-screen on a tablet or smartphone.

Samsung did not copy the “snap-back” feature or any other

patented part of Apple’s design, but even if it did, that would

not be a primary draw for a consumer, said Samsung lawyer

Kathleen Sullivan.

“There is absolutely no evidence that any consumer, as

opposed to an engineer, has said, ‘I’m going to purchase

something because of this snap-back feature,'” Sullivan said.

During oral argument, the lawyers and judges alluded to

internal Samsung documents in which engineers or other employees

considered the importance of the snap-back feature. Those

documents have not been made public.

Apple and Samsung agreed to submit letters to the court by

April 13 on how best to preserve confidential information in the

case. A ruling by the appeals court could come any time

afterward.