I created a transit app for the TTC in Toronto.
(https://itunes.apple.com/ca/app/ttc-watch-for-toronto/id505286932?mt=8)
Yesterday, I received a package from Lemer & Company representing Dovden Investments, Ltd. The package claims that my app infriges their patents.
Patents:
http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2283239/summary.html
http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2363556/summary.html
I am reaching out to HN because I know there are many transit apps out there that have the same functionality: letting users know when the next bus will arrive using a third-party API (from NextBus, or GTFS Realtime for example).
So, if anyone has dealt with Dovden or has had a similar experience (or ArrivalStar in the US), please contact me at barum.rho@gmail.com
More details:
My apps use the API provided by NextBus who apparently licensed these patents. The patents describe a system that includes a vehicle unit (GPS) and a central server that processes GPS locations, neither of which are part of my app. They offered a "discounted" licensing fee, but my apps have generated income nowhere near the amount.
Please upvote for a better chance of finding other transit app developers.
However, in the case where you think the other party is bluffing, I would not hire a lawyer right away. The other party's only enforcement option is suing you. If they sue you, then hire a lawyer.
The big issue is whether to respond. If you don't respond, they will stop contacting you after a certain number of attempts. If you do respond, you will get their attention. That can be good if you think you have a strong defense like mistaken identity or something. If I were you, I would ignore them and see if they sue.
Edit: I looked up Lemer & Company and they are personal injury lawyers, not patent attorneys. They were probably hired only to write scary letters, which is more reason to ignore them until if or when they refer the case to patent counsel for litigation.