Detect
USPTO expiration events without a later reinstatement. Design patents and revived files are filtered out.
Fee-lapse patents, ranked every week
Lapsight reads official USPTO maintenance-fee events. You get identifying data only: number, title, assignee, date, score, and follow-on tier. No invention ideas.
- ✓ 14-day sample listing on the public site
- ✓ No credit card to browse lookup
- ✓ Cancel anytime from the email
Weekly ranked feed
H04 · Tier 1 · identifying data only
- US 651035078.4
- US 720430061.9
- US 694170057.1
US 6510350
Remote data access and system control
2007-07-21 · G05B
View source →
Official records we point you back to
- USPTO PTMNFEE2
- Google Patents
- Espacenet
- Patent Center
- ppubs
How the signal is built
Score
Citations, family size, claims, technology neighborhood, remaining would-be term, age, assignee type.
Rank
Weekly email is identifying data only. Every patent links back to Google Patents, USPTO, and Espacenet.
Follow-on difficulty
- Tier 1 — Clean Path. Default. The scoring model sees a relatively open follow-on path: moderate crowding, more remaining would-be term, and less concentrated corporate assignee density.
- Tier 2 — Some Pushback. Still useful, but expect more examination resistance: busier technology neighborhoods, larger families, or well-resourced original assignees.
- Tier 3 — Hard Fight, Worth It. Crowded art or thick families. The opportunity score is high enough that some teams still want the lead, knowing a follow-on filing will be a fight.
Who the feed is for
A weekly ranked list of U.S. patents that expired because a maintenance fee was missed. Built for teams who need identifiers, not invention ideas.
Product studios
You need a short weekly list of recently expired U.S. patents in the technologies you actually ship — not invention sketches.
- Weekly list of lapsed patents in your technology area
- Opportunity score per patent
- Direct links to Google Patents and the USPTO
IP boutiques
Associates still confirm legal status. Lapsight is extra research input, not a substitute for counsel.
- Ranked identifying data: number, title, assignee, date
- Follow-on difficulty so you know how crowded similar patents are
- One-click cancel from every email you send a client
Corporate scouts
Missed maintenance fees are easy to overlook in commercial patent software. We keep them on a weekly cadence.
- Same Monday list across the areas your team tracks
- CSV export for internal review
- Official source links on every row
Investors & licensing
You want public identifiers of patents that expired for non-payment, with a score you can scan — not product ideas.
- Score and remaining would-be term at a glance
- Links to Google Patents, USPTO, and Espacenet
- A sample listing you can share before you buy
Free sample listing
A live slice of the ranked archive: patent, assignee, expiration, score, and official source links.
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Is a patent lapsed?
Look up a US patent number against our fee-lapse archive.