Awesome site, this is the best one today. https://patents.google.com/patent/US5588175
Word of warning, privacy services like Privacy Badger and Decentraleyes block the data tables cdn your using so your users using those services see no data at all
Word of warning, privacy services like Privacy Badger and Decentraleyes block the data tables cdn your using so your users using those services see no data at all
The patents expiring today website seems to have a simple view of patent expiry, based on 20 years from publication date. The legal expiry date is more complex, and often much earlier.
The patent owner is required to pay maintenance fees [1]. Google patents shows this information under "Legal Events". In this patent, the owner allowed the patent to lapse after 3 years, but eventually petitioned the office for reinstatement and paid the tolls for the 3rd and 7th years. One might expect that this patent term actually expired 11 years after filing, in 2006.
Some patents are given a patent term adjustment (extension) based on administrative delay not caused by patentee. Other patents have their expiry tied to another patent by terminal disclaimer. The USPTO provides a calculator (Excel spreadsheet, meh) for calculating, and additional explanations. [2]. This patent doesn't appear to be subject to term extension or terminal disclaimer.
This patent's term is more complex because the Uruguay Rounds Agreement Act significantly changed the rules for patent terms, for patents filed after June 7, 1995. This patent falls into one of the exceptions. This is described somewhat in the Manual of Patent Examining Procedure section 2701. [3]
The original website is a very interesting concept. It could be even more interesting by incorporating more rules about patent expiry, allowing filters on patents allowed to go expired, patents that were revived, and so on. It would require incorporating additional information from the USPTO Public Pair database.
[1] https://www.uspto.gov/patents-maintaining-patent/maintain-yo...
[2]https://www.uspto.gov/patent/laws-and-regulations/patent-ter...