The Latest Dongle Gear Actions: Canon’s Checkmate

The Latest Dongle Gear Actions: Canon’s Checkmate

The Latest Dongle Gear Actions: Canon’s Checkmate

  • Canon has sued manufacturers and distributors of new-built cartridges again.
  • This time, Canon has reached back to erase the patent workarounds introduced by these manufacturers.
  • So are any cartridges safe? Yes: remanufactured ones.

The Latest Dongle Gear Actions: Canon’s CheckmateOn February 28, 2018, Canon brought its latest patent enforcement efforts against 49 aftermarket manufacturers, distributors, and sellers of new-build compatible cartridges. These actions have been brought in U.S. district courts, and before the U.S. International Trade Commission (USITC). Although the lawsuit has been analyzed by many, no one has yet discussed what it means for the aftermarket going forward.

After analyzing the patents that are the subject of the suit, along with the actions Canon has brought before these actions, aftermarket suppliers of new-built cartridges may have serious legal and technical impediments for future manufacturing of Canon cartridges equipped with a dongle gear drive mechanism.

Who are the big winners?  Remanufacturers that are able to reuse the OEM gear and dongle.

All the patents in the first action brought by Canon over the dongle gear (“Dongle Gear I”) required a coupling member that was “tiltable” with respect to the OPC drum.  As shown in Image 1 taken from Canon’s patents, when a cartridge with a “tiltable” dongle is inserted into the printer, the dongle (15150) moves from a tilted position (top left drawing “a”) to a straight position (bottom right drawing “d”) relative to the OPC drum (107) as it engages with the printer drive pin (180).

When the cartridge is removed, the reverse occurs and the dongle tilts out of alignment with the OPC drum.  This tilting allows cartridges with an OEM style tilting coupling member to be smoothly engaged and disengaged from the printer drive system.The Latest Dongle Gear Actions: Canon’s Checkmate

The Dongle Gear I litigation targeted copycats of the tilting dongle OEM design.  In response to Dongle Gear I, the new-build cartridge manufacturers began coming up with “non-tilting” dongle gear replacements.  Ninestar, Aster, Print-Rite, and Static Control Components all came up with variations on a retractable dongle design.  In these designs, the dongle remains in line with the OPC drum, but is moveable in and out of the drum, somewhat like the plunger in a syringe.

The images below are taken from a Print-Rite patent and illustrate how these retractable dongle designs work.  In these designs, the dongle is moveable in and out of the drum gear in the directions of the red arrow.  As shown in the bottom three images and starting on the left, the cartridge is inserted into the printer in the direction of the arrow y, then the dongle engages the printer drive pin and is pushed into the drum gear in the direction of the arrow x (bottom middle image).

When the cartridge is fully inserted, a spring (top figure) pushes the dongle in the direction of the arrow z (bottom right image) and into engagement with the printer drive pin.  While the Print-Rite and Static Control designs rely on contact with printer components and a spring to move the dongle in and out of the gear, the designs from Ninestar and Aster use systems of gears and/or levers to move the dongle in and out of the gear.

The Latest Dongle Gear Actions: Canon’s Checkmate

Developing the new workarounds was not a seamless transition. Early versions of the designs faced many issues, most notably difficulty inserting and removing the cartridge from the printer.  In some cases cartridges would get stuck so badly hand tools were required to extract them.

Nonetheless, in the time it took the ITC and U.S. Federal Courts to hand Canon its victory, the aftermarket suppliers had refined their non-tilting dongles and had begun successfully importing and selling compatible cartridges equipped with these designs.  Canon was well aware of this development as  settlement documents from the litigation and press releases from some of the aftermarket suppliers all referenced the non-tilting dongle replacements.

But Canon was not defeated, as its next and latest move was, perhaps, its checkmate. As the aftermarket had shown its hand, Canon began filing “continuation” patents specifically targeting the non-tilting dongle designs.  Although filed with the patent office after the aftermarket designs were released, these continuation patents are treated as though they were filed in 2006 – when Canon first filed for protection on the dongle gear design.

There was no prior art for the non-tilting dongles that dated back that far.  And it’s a well-settled rule of patent law that a patent holder can file a continuation application claiming its invention in a slightly different way.

In targeting the non-tilting design, Canon’s new patents focus on the fact that in both the tilting and retractable dongle design, the tip of the dongle moves between two positions, one where the tip is closer to the OPC drum and another where the tip is farther from the OPC.  In both instances, the tip is closer to the OPC drum when the dongle is disengaged from the printer drive, and farther from the OPC drum when the dongle is engaged with the printer drive.

Canon’s new patents specifically call out how the tip of the dongle moves between a first position where the tip is a first distance (D1) away from the OPC drum and a second position where the tip of the dongle is a second, shorter distance (D2) away from the OPC drum. As depicted in “Figure 11,” taken from an exhibit in Canon’s USITC complaint, Canon is aligning the language of its patents with the operation of Print-Rite’s retractable dongle design.

By obtaining patents covering movement of the dongle toward or away from the OPC drum, Canon has put the aftermarket manufacturers in a very difficult position.  How will the aftermarket design a dongle gear that doesn’t rely on such movement, while also providing smooth installation and removal of the cartridge from the printer?

Moreover, even if new build compatible manufacturers come up with yet another functional design that gets around one or more of Canon’s patents, there is nothing stopping Canon from filing even more continuation patents covering those new designs.

The Latest Dongle Gear Actions: Canon’s Checkmate

This case highlights another often misunderstood aspect of patent law – just because you have a patent on your design does not mean you are safe from infringement.  As noted above, Print-Rite has patented the design that Canon now accuses of infringement.  Static Control, Ninestar, and Aster also all hold U.S. patents on their respective designs.  In fact, Static Control and Aster are currently engaged in their own patent infringement skirmish based on their respective retractable dongle designs, and now both have been sued for infringing Canon’s latest patents.  Their patents provide no protection from Canon’s patents, which are deemed first in time.

Aftermarket members have managed to outsmart or outrun the OEMs before, and may again this time.  But that route is neither obvious nor inexpensive.  And while some current manufacturers may continue to offer indemnification for their products against a potential Canon lawsuit, that protection may be short-lived.

It is only a matter of time before the current new build replacements for Canon’s dongle cartridges become subject to a General Exclusion Order (GEO), which Canon has already requested from the USITC. Then these products will be prohibited from entering the country.

So as it was before the arrival of the new-built cartridges, it appears remanufactured cartridges, with reused OEM gears, may once again be the only legitimate competition for new OEM ones.


Tricia Judge has served as the executive director of the International Imaging Technology Council—a not-for-profit trade association serving imaging supplies remanufacturers and dealers—for 17 years. She was the executive editor of Recharger magazine for five years and a lawyer for 30 years. Judge’s work has been published in Recharger, Imaging Spectrum and several other industry magazines. She has won critical acclaim for her writing and industry advocacy. She prides herself in having assisted with the preparation of six friend-of-the-court (amicus) briefs and has presented the position of the industry to the US International Trade Commission. Since 2017, Judge has been the Senior Consulting Editor of RT Imaging World magazine and speaks at regional RT VIP Summits and RemaxWorld Expo in China.

Her feature articles include:

Her Judge’s Ruling opinion blogs:

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