Invalidity dossier
US 5600064
Added 9/23/2026, 5:05:37 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 5600064 A
Title: Electronics for coriolis force and other sensors
Assignee: Charles Stark Draper Laboratory Inc (original and current, per the listing)
Inventor: Paul Ward
Key dates: Priority date 1994-03-28; filing date 1995-05-24; publication/grant date 1997-02-04; anticipated expiration 2014-03-28 (status: Expired – Lifetime).
Application number: US08/448,789
Purpose. The patent addresses error sources in Coriolis force sensors, such as gyroscopes for sensing rotational rate. In these sensors, a proof mass is vibrated in-plane by a drive (excitation) signal electrostatically coupled through a drive electrode, and an output sense electrode detects out-of-plane deflection caused by Coriolis forces from an inertial input. Parasitic capacitances can cause the drive signal to couple into the sense electrodes, degrading amplitude control and contaminating the output signal. Other problems include closed-loop phase error (drift) and quadrature.
Plain-language scope. The disclosed electronics include an "off-frequency drive scheme" for reducing in-band coupling of the drive signal to the output signal, a phase-error reduction technique, and a quadrature nulling circuit. In one arrangement, a frequency translation circuit sits in feedback between an output transducer and an input transducer, suppressing a component of the feedback signal at a predetermined frequency to produce the drive signal; the input transducer's nonlinear characteristic converts that drive signal into a force signal. Because the drive signal has no energy at the output frequency, conventional filtering can remove contamination without losing desired information. A tuning fork gyroscope implementation is described using the off-frequency drive scheme plus one of the phase-error reduction and quadrature nulling techniques. A servo system establishes fixed-amplitude in-plane proof-mass motion; Coriolis-induced out-of-plane motion is proportional to input inertial rate, and the in-phase-with-motor-velocity component is sensed.
Source: https://patents.google.com/patent/US5600064/en
What the excerpt does not establish: It is explicitly marked "[Excerpt only; consult the source for omitted text]," so the full claims, complete description, figures, and any claims/embodiments beyond those summarized here are not established. No prior-art references are identified in the supplied text.
Generated 10/1/2026, 9:43:51 PM
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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