Triplex redundancy refers to an architecture with three parallel processing or actuation channels, where a majority-voting scheme resolves disagreement and isolates a faulted channel. In this dataset it appears alongside dissimilar redundancy, where the three channels additionally use different hardware or software to reduce the chance of a common-mode failure taking out all channels at once. The representative record in this landscape, US7877627B1, is a direct example: three primary and three redundant processor modules with 2-out-of-3 output voting.

The ranking returned by this dataset covers 15 companies across 31 records, led by a single assignee with 6 records — nearly triple the count held at fifth place, which sits at 2. The top five combined account for 21 records, or 67.7% of all records in scope, and the top ten account for 27, or 87.1%. That is a steep concentration curve: a small group of aerospace and industrial-control filers holds most of the documented claim space, with the remaining ranked assignees each holding a single record.

The trend data shows 10 filings in 2017 against zero in the most recent complete year, but that decline should be read cautiously. Patent publication typically lags the actual filing date by around 18 months, so the last one to two years in any dataset are always undercounted relative to what has actually been filed. A genuine slowdown cannot be confirmed until enough time has passed for those recent filings to publish.

US7877627B1 claims a specific combination: three dissimilar primary processor modules paired with three dissimilar redundant processor modules, each fed by its own input modules, with a 2-out-of-3 voting output stage that continues producing output even after hard failures in the primary set. A design that avoids the dissimilar hardware-and-software pairing, or that uses a voting ratio or channel count outside that specific claimed structure, sits outside its literal scope. Anyone building a triplex voting scheme close to this structure should read the full claim set rather than relying on the abstract, since the dissimilarity requirement and the specific 2-out-of-3 output logic are likely the narrowest and most defining limitations.

Relative to G05B control and regulating systems, which covers 71.0% of the 31 records in scope, several adjacent classes show far lower density: G01R electric and magnetic measurement sits at 6.5%, and B64D aircraft equipment and G01C navigation and gyroscopes each sit at 3.2%. That does not guarantee open white space, since a single strong filing can dominate a thin class, but it flags specific, narrower areas — instrument-level fault detection and gyroscope-integrated channel comparison among them — worth a dedicated search before assuming the ground is occupied.