In this corpus, environmental durability spans weatherproof housings, sealing and gasket design, corrosion-resistant connectors, and protective coatings rated for UV, moisture or temperature extremes, alongside the meter and communications hardware they protect. A large share of the relevant claims sit in materials and chemistry IPC classes such as A01N, C07D and C07C rather than in metering-specific electronics classes, so a durability search scoped only to smart-meter hardware classes will undercount the field. Practitioners should expect relevant prior art to come from coatings and enclosure suppliers as much as from meter manufacturers.

Yes. Filings rose from 51 in 2017 to a peak of 93 in 2018, held near 68 by the midpoint year of 2022, and have declined since, with the most recent year showing only 12 records. Because publication lags filing by roughly 18 months, that final year will rise somewhat as more records publish, but the multi-year direction is clearly down from the 2018 peak. This pattern is typical of a field where core protective claims were staked early and the remaining activity is incremental.

The corpus includes large diversified chemical and technology filers among its most historically active assignees, but recent-year momentum data shows most of them recorded zero filings in the latest tracked year. Only one of the tracked assignees was still filing in the latest year, and even that filer's volume dropped sharply year-on-year. This suggests the historic leaders have largely completed their core claim positions rather than continuing to expand them.

The IPC composition shows metering-communications classes (G06F, H04L) trailing well behind materials and chemistry classes in overall volume, which points to comparatively thin coverage around combined thermal-and-moisture sealing for communications modules, corrosion-resistant outdoor connectors, and coatings engineered for combined UV and humidity exposure rather than either stressor alone. These are narrower, more technically specific branches than the broad weatherproofing art that dominates the corpus, and they are where a first claim is more likely to clear existing prior art.

US20180039290A1, assigned to Sensus USA, Inc., claims a method for running a hydraulic model using real-time or near-real-time AMI data to improve water-demand accuracy at service nodes in a distribution network. It is a data-modelling and demand-calculation claim built on top of AMI output, not a claim on meter housing, sealing or weatherproofing hardware. Anyone building AMI-fed hydraulic modelling tools with similar service-node demand estimation techniques should review it closely, but it does not restrict work on the physical durability of the metering hardware itself.