TheOptimizationIdiot - 8:14 pm on May 3, 2013 (gmt 0)
Yeah, it was applied for in 2005 and I have a tough time having seen the things I've seen and thinking it hasn't been in use for quite a while actually.
Back in-the-day when I'd make a change to a set of pages, like clockwork, they would drop immediately after they got spidered. (I mean disappear from the SERPs). 4 to 7 days later they would bounce back in to page 4 or 5 then they'd start to move up. (If I made a "significant change" then, "poof", they were gone from the SERPs for 4 to 7 days again.)
It's been a while since I've seen the "exact pattern" so I might not have this quite right with the positions, but, when they hit page 3 if they were 26 to 28 they'd end up on page one, usually in the top 3. If they were 23 to 25 there was some "flux" on where they ended on page 1. If they hit 21 or 22, they got stuck on page 2. If they were 29 or 30, they'd stay on page 3 for another bounce. If a page's initial landing position on page 2 was 11 or 12, it stuck there didn't make the first page, but 14 to 16 was almost always top 2 on page 1 when it stopped.
It was so mechanical I used to know within a place or two of where they'd end up as soon as they hit page 2.