Or perhaps it could be a fixed duration per field, somehow, so that you know before filing what you will get. It would be easy to discriminate between 20 years

Or perhaps it could be a fixed duration per field, somehow, so that you know before filing what you will get. It would be easy to discriminate between 20 years for drugs vs. 5 for anything software, but I guess it's tricky to decide whether something like e-paper should count as fast-moving consumer-facing tech or hard-won physics/chemistry knowledge.