Lapsed Jul 23, 2017 on the fee record · High confidence
20-year base term ended Aug 5, 2023
First maintenance fee unpaid; grace period ended.
Held by Pfizer Products Inc.
Filed Aug 23, 2012 as application 13/593,263 · Granted Jul 23, 2013
Base term, 20 years from filing
Today
Lapsed Jul 23, 2017
2003
2026
Clock starts
Aug 5, 2003
Aug 5, 2003
No longer in force
Jul 23, 2017
Jul 23, 2017
Granted
Jul 23, 2013
Jul 23, 2013
Term would have run to
Aug 5, 2023
Aug 5, 2023
base term
after the term ends
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
0 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
2
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Aug 5, 2023: its 20-year base term, with no adjustment for prosecution delay. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Aug 5, 2003, when application 10/636,834, the earliest non-provisional in its chain, was filed (this one was filed Aug 23, 2012) | Aug 5, 2023 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 2 maintenance fees paid | lapsed Jul 23, 2017 | High confidence |
| Computed term end | The steps above, in order | Jul 23, 2017 | High confidence |
This family
| US 8,257,739 | In force Sep 2027 | Sep 2027 |
| US 8,491,933 | this patent Jul 2017 | Jul 2017 |
The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Sep 26, 2012 Reel 29027, frame 166 | Pfizer Inc.; Pfizer Products Inc. | Bend Research, Inc. | Assignment of Assignor's Interest |
| Sep 11, 2013 Reel 31182, frame 146 | Bend Research, Inc. | Pfizer Inc. | Assignment of Assignor's Interest |
| Sep 11, 2013 Reel 31182, frame 154 | Babcock, Walter C.; Caldwell, William B.; Crew, Marshall D.; Friesen, Dwayne T.; Smithey, Daniel T. | Bend Research, Inc. | Assignment of Assignor's Interest |
| Sep 11, 2013 Reel 31182, frame 176 | Pfizer Inc. | Pfizer Products Inc. | Assignment of Assignor's Interest |
| Sep 11, 2013 Reel 31182, frame 204 | Shanker, Ravi M. | Pfizer Inc.; Pfizer Products Inc. | Assignment of Assignor's Interest |
| Sep 11, 2013 reel/frame not recorded | Shanker, Ravi M. | Pfizer Inc. | Assignment of Assignor's Interest |
| Sep 11, 2013 reel/frame not recorded | Shanker, Ravi M. | Pfizer Products Inc. | Assignment of Assignor's Interest |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2013 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.