Google Patent's interface is dumb. This means "Today (on 2020-03-09), the patent application is not in a state of pending to be filed." The fact they put this in the Events section is horrible UI. It's not an event, it's a current status as of the date the webpage was loaded. And it does mean that the patent is expired or not, it's a boolean specifying that the patent is filed (active) or pending filing. A better UI would be the text "Filed: yes" somewhere.
I don't understand what this means. US Patents are 20 years, right? And it was applied for in 1999, so it must be expiring?
Perhaps. I'm just pointing out (badly) that when this was posted (March 8th depending on Timezone) to HN that new status may not have been there. That latest status updated just happened March 9th.