An insurer that spent years defending a sensor maker now wants out, telling a California court a $58 million product claim isn't covered.
Atlantic Specialty Insurance Company has asked a federal court to declare that it owes nothing more to its policyholder, Applied Physics Systems, in a long-running Canadian product fight. In a complaint for declaratory judgment filed July 15, 2026, in the US District Court for the Northern District of California, the insurer seeks a ruling that it has no duty to defend or indemnify Applied Physics in a lawsuit brought in Alberta by Phoenix Technology Services.
Phoenix, a drilling-technology company, alleges that directional sensors it bought from Applied Physics - units called AP750s - failed prematurely downhole. According to the Alberta statement of claim, Phoenix ordered the sensors to a 150ºC temperature specification and alleges that components inside were not rated for that heat. Phoenix says the failures forced it to pull tools from customers' wells, install replacements, issue credits, and launch its own investigation.
Phoenix's Alberta claim seeks $58,189,651.48 CAD. It splits that into six categories, all economic: $4.65 million to buy the sensors, $742,037.50 for repairs, $171,750 for retrieval and replacement, about $2.47 million in customer credits, $160,300 for the internal investigation, and $50 million in lost business revenue.
Here's the part claims professionals will care about. Atlantic Specialty issued Applied Physics six general liability and umbrella policies running from January 1, 2012 to January 1, 2018. Since April 2022 it has paid for Applied Physics' defense in Alberta - but under a reservation of rights, keeping the door open to challenge coverage later. It is now walking through that door.
The insurer's core argument, repeated for each of the six damage categories, is that these costs are not "damages because of ... 'property damage'" caused by an "occurrence," as the policies require. The policies define an "occurrence" as "an accident, including continuous or repeated exposure to substantially the same general harmful conditions."
Atlantic Specialty also points to several policy exclusions. One bars coverage for "'Property damage' to 'your product' arising out of it or any part of it" - the kind of provision that generally keeps an insurer from paying to repair or replace the policyholder's own product. The insurer relies on that exclusion and related ones covering the insured's own work and "impaired property."
There is also a timing argument. The policies apply only if no insured knew, before the policy period, that the "property damage" had already occurred. Atlantic Specialty alleges that Applied Physics knew its sensors were failing early - by no later than 2012, the year the first policy began - and that the damage and the insured's knowledge of it predated the policy periods. On that basis, it argues, the policies never attach.
Atlantic Specialty says discovery in the Alberta case has "conclusively established that there are no potentially covered damages." If the court finds no possible indemnity for any category of loss, it argues, the duty to defend should fall away too.
None of this has been tested in court. The complaint was filed on July 15, 2026, and its allegations are unproven, and no court has ruled on coverage. The underlying Alberta lawsuit is also unresolved, and Phoenix's claims against Applied Physics remain allegations that have not been decided.
