An aldehyde differs from a ketone because of its hydrogen atom attached to its carbonyl group, making aldehydes easier to oxidize. Ketones don't have a hydrogen atom bonded to the carbonyl group, and are more resistant to oxidation.
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Garmin filed another IPR for this patent on June 20, 2013 (probably for the claims that didnât get reviewed in the first IPR): IPR2013-00373.