Inventor · disambiguated record
Spencer D. Roberts
Also filed as: ROBERTS SPENCER D · ROBERTS SPENCER DONALD
5 granted patents·356 citations·filing 1975–1990
85Inventor score
Technology areasG11B
Files withIBM5
Top patents by PatentIndex Score
5 records- 0196US4015799AAdaptive reel-to-reel tape control systemIBM·Filed 1975·Granted Apr 5, 1977·120 cites·12 claims
- 0294US4914725ATransducer positioning servo mechanisms employing digital and analog circuitsIBM·Filed 1989·Granted Apr 3, 1990·86 cites·27 claims
- 0394US4125881ATape motion control for reel-to-reel driveIBM·Filed 1977·Granted Nov 14, 1978·88 cites·17 claims
- 0492US5038333APositioning systems including reliable track crossing detection for high speed relative motionsIBM·Filed 1989·Granted Aug 6, 1991·59 cites·15 claims
- 0536US5128913AAcquiring focus in an optical system using a soft focus acquiring systemIBM·Filed 1990·Granted Jul 7, 1992·3 cites·12 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →