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Keith Halford — 3 Patents

ATAT&T: 3 patents #5,559 of 18,772Top 30%
Madison, MS: #31 of 101 inventorsTop 35%
Mississippi: #871 of 4,257 inventorsTop 25%
Overall (All Time): #1,328,092 of 4,157,543Top 35%
3 Patents All Time
Keith Halford has been granted 3 US patents while listed as an inventor at AT&T. The first was granted in 2004 and the most recent in May 2011. Keith Halford ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Keith Halford in Madison, MS, US.

Patents per Year

Patents granted per year, 2004 to 2011Bar chart with a peak of 1 patents in 2004.peak 12004: 1 patents20042008: 1 patents20082011: 1 patents2011

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
7945033 Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system — 2011-05-17 $20,511,000
7447300 Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system — 2008-11-04 $41,617,000
6707894 Prepaid calling time processing: a method and apparatus for processing pre-paid calling time in a telephone communication system — 2004-03-16

Nearby-Ranked Inventors

Daniel Silion3
Hangfeng Li3
Mark Vander Wal3
Chad M. Goltzman3
Sathish Kumar Thanganathan3
Debbie Maloyd3
Ethan Alexander Garrett3
Paul Sabatka3
Sergii Bomko3