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USPTO Patent Rankings Data through Dec 31, 2025
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Derek J. Kroes — 4 Patents

RRRead Rite: 3 patents #73 of 255Top 30%
PIPower Integrations: 1 patents #146 of 206Top 75%
Fremont, CA: #3,591 of 9,298 inventorsTop 40%
California: #126,026 of 386,348 inventorsTop 35%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
Derek J. Kroes has been granted 4 US patents while listed as an inventor at Read Rite. The first was granted in 1997 and the most recent in November 2009. Derek J. Kroes ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list Derek J. Kroes in Fremont, CA, US.

Patents per Year

Patents granted per year, 1997 to 2009Bar chart with a peak of 1 patents in 1997.peak 11997: 1 patents19971999: 1 patents19992000: 1 patents20002009: 1 patents2009

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
7613019 Method and apparatus to limit maximum switch current in a switch of a switching power supply 2009-11-03 $7,033,000
6078479 Magnetic tape head with flux sensing element Daniel A. Nepela, Erich P. Valstyn 2000-06-20 $2,822,000
5923505 Magnetoresistive sensor having a pinned soft magnetic layer Marcos M. Lederman, Samuel W. Yuan 1999-07-13 $3,389,000
5627704 Thin film giant magnetoresistive CPP transducer with flux guide yoke structure Marcos M. Lederman 1997-05-06 $22,186,000