The US Patent Trial and Appeal Board has spent 2026 working through a stack of Stratasys patents, and one of them matters to the RFID industry well beyond 3D printing. US 10,569,466 B2, “Tagged build material for three-dimensional printing”, claims the mechanism a great many vendors in a great many sectors now sell as standard: put a tag on a consumable, have the machine read it, and let the machine configure itself or refuse to run.
Trade reporting in early October 2026 says the Board has now found challenged claims of the ‘466 patent unpatentable. The decision had been due by 7 October 2026 and is not yet reflected in the public docket, so the claim-by-claim detail is not yet confirmable. The shape of the proceeding is on the record, though, and that is enough to see what is at stake.
The PTAB is the USPTO’s Patent Trial and Appeal Board, which hears administrative challenges to granted US patents. Inter partes review is the route by which a third party asks it to reconsider whether claims should have been granted at all, usually on prior art the examiner did not weigh. Stratasys is a US and Israeli industrial 3D printing manufacturer; the challenger, Shenzhen Tuozhu Technology, is the parent of Bambu Lab, a Shenzhen based maker of consumer and prosumer desktop 3D printers.
What the patent actually claims
US 10,569,466 B2 was filed on 5 October 2018 and granted on 25 February 2020, with a priority date of 29 October 2012 running back to provisional application 61/719,874. Anticipated expiry is 28 October 2033. It descends, via a 2016 continuation, from application 14/064,974 of 28 October 2013, which issued as US 9,233,504.
Inventors Ariel Douglas, Robert J. Steiner, Aric Lynn Jennings, William B. Buel and Anthony D. Moschella assigned the invention to MakerBot Industries LLC on 9 October 2018, and MakerBot assigned it on to Stratasys, Inc. on 19 July 2022 after the two businesses merged. Stratasys is therefore asserting consumer 3D printing RFID patents it acquired rather than originated.
The specification is explicit about radio frequency identification. The data tag “may be a radio frequency identification (RFID) tag such as an active or passive RFID tag”, and the document explains the difference in textbook terms: an active tag carries its own power source to broadcast, a passive tag has none and is powered by converting the reader’s signal into a voltage. Those terms are set out in the RFID glossary. The sequence is equally familiar. The tag sensor broadcasts a signal requesting data, the tag responds with its stored data, and the sensor passes it to the printer’s controller.
The data set is wide: material identification number, build material type, diameter, extruder temperature requirement, melting temperature, colour, colour lot number, cost per unit, density, tensile strength, viscosity, recycle code and expiration date. Anyone who has specified a consumable tag in any industry will recognise that, because it is more or less the list.
Then comes authentication. The tag sensor “may be configured to read an authentication code from the data tag”, and the controller proceeds with the build only if that code authenticates. The specification itself describes this as a way of providing digital rights management. That is the patent’s own framing, not a critic’s gloss on it. What the patent never does is specify a radio: no frequency band is named anywhere in it and no air interface standard is cited. The claim is to the function, not to the physics.
The challenge, and the campaign around it
The challenge is IPR2025-00438, filed on 6 February 2025 by Shenzhen Tuozhu Technology. The Board instituted review on 6 October 2025, taking in claims 1 to 5, 7 to 13 and 16 to 20. By statute it must decide within 12 months of institution, extendable by six months for good cause, putting the projected due date at 7 October 2026.
It is not an isolated petition. Law360 reported on 30 September 2026 that the Board had invalidated as obvious nearly all the claims Bambu Lab challenged in three further Stratasys patents: US 10,556,381 and US 9,168,698, both on force detection, and the member of the US 10,124,540 family known in the proceedings as the ‘774 patent, on the detection and use of printer configuration information. That one was aimed at Bambu Studio’s synchronisation of its filament list from the AMS, Bambu’s Automatic Material System, the multi-material unit that reads RFID tags on filament spools.
Two further reviews, IPR2025-00611 and IPR2025-00531, reached final written decisions dated 28 September 2026, and 3D Printing Industry reported the Board found challenged claims of US 9,592,660, on a heated build platform, and US 8,562,324, on networked 3D printing, unpatentable. Not everything has gone the challenger’s way. On 9 June 2026 the Board upheld the purge tower patent, US 9,421,713, and Bambu has appealed to the US Court of Appeals for the Federal Circuit.
The damages award running alongside
On 17 September 2026 a jury in the US District Court for the Eastern District of Texas, Marshall Division, found willful infringement and returned about $27.6 million in past damages, with Judge Rodney Gilstrap signing the judgment on 18 September 2026. The largest slice was $14.2 million on US 9,421,713 for purge towers, plus $10.6 million on US 7,555,357 for remnant toolpath in extrusion based layered deposition and $2.8 million combined on the two force detection patents. No injunction was issued and Bambu Lab’s printers remain on sale. Stratasys said it “remains focused on delivering cutting-edge technologies to customers”, and both companies otherwise declined to comment.
That case, 2:24-cv-644, was filed on 10 August 2024, one of two Stratasys suits in 2024 alleging infringement of ten patents between them. The second has yet to reach trial and has no trial date. Its complaint covers RFID data tags on filament spools, networked printing, a networked printer with a 3D scanner, and the detection and use of printer configuration information. US 10,569,466 belongs to that second case, so a validity ruling against it bears on the litigation as much as on the patent.
What it means for anyone shipping tag-authenticated consumables
The 3D printing press has covered all this as a printer war. For the auto-ID industry it is a live test of how much exclusivity anyone can get over reading a tag on a consumable and letting the machine decide what happens next. The answer so far is less than a product team might hope.
Strip the ‘466 specification back and the mechanism is a reader, a tag, a data set and a conditional. All four were in commercial service long before the October 2012 priority date. Livestock and laundry tagging were reading item data to drive a process through the 1990s, instrument and printer consumables were already authenticated by chip, and dispensing equipment read a token and configured itself accordingly. When a claim is granted across a landscape that broad and a well resourced challenger goes looking, the prior art turns out older and deeper than the filing date implies.
Novelty, then, is unlikely to sit in the read itself. Where the tag is read and what it carries is art from the last century in most sectors. A patent position that has to carry commercial weight probably needs something narrower: a specific encoding, a cryptographic scheme, a sensing or tamper-detection method, or a manufacturing technique for the tag or its carrier.
The framing is worth sitting with too. “Digital rights management” is the ‘466 specification’s own description of consumable authentication, and it describes a commercial policy rather than a technical advance. Vendors across authentication and security applications will say, often correctly, that the tag protects patient safety, calibration accuracy, traceability or warranty integrity. The difficulty arrives when a claim is drafted around the machine refusing to operate rather than around how that refusal is achieved. At that point it describes a business model, and the Board is not a forgiving audience for one.
Naming no band and no standard cuts both ways as well. It makes a claim look broad on paper, which is the attraction, and it leaves the prior art universe as every radio ever used for the purpose. None of this is legal advice, and one final written decision settles one patent on one record, but the direction of travel across the Tuozhu petitions is consistent enough to be worth a line in a product plan: a competitor’s tag-authentication patent may be more fragile than a demand letter suggests, and so may your own.
