Registered patent attorney
Leon M. Cao
Firm
Banner & Witcoff
Address
71 S Wacker Dr
#3600
Chicago, IL, 60606
US
Phone
Registered as
Registered patent attorney
Other attorneys at Banner & Witcoff
Other patent attorneys in Chicago, Illinois
- Lawrence H AaronsonMcDonnell Boehnen Hulbert & Berghoff LLP
- Dennis J AbdelnourHonigman LLP
- Holby Matthew AbernNeal, Gerber & Eisenberg LLP
- Cassandra L. AbernathyUSPTO Reg. 75330
- John AbramicSteptoe & Johnson LLP
- David Brian AbramowitzLocke Lord LLP
- Hugh A AbramsShook, Hardy & Bacon LLP
- Matthias AbrellMarshall Gerstein & Borun, LLP
Frequently asked
Frequently asked about Leon M. Cao
Is Leon M. Cao a registered patent attorney?
Yes. Leon M. Cao is a registered patent attorney with the United States Patent and Trademark Office (USPTO Registration Number 83952). Registration is verified against the USPTO Office of Enrollment and Discipline roster.
Where is Leon M. Cao located?
Leon M. Cao's office is in Chicago, Illinois (60606). Affiliated with Banner & Witcoff.
What firm does Leon M. Cao work at?
Leon M. Cao is listed as affiliated with Banner & Witcoff on the USPTO Office of Enrollment and Discipline practitioner roster.
How do I contact Leon M. Cao?
Leon M. Cao's office phone (per the USPTO public roster) is 312-463-5461. Verify availability and intake details directly with the firm before sending privileged materials.
Should I prepare anything before contacting a patent attorney?
Yes — most patent attorneys quote based on a brief. Persoona's intellectual property module generates a prior-art analysis, defensibility scorecard, and a draft USPTO filing package so you arrive with a brief, not a blank slate. Free to run.
Profile sourced from the USPTO OEDCI Practitioner Roster. Persoona did not provide, edit, or curate this data — every field is pulled directly from the public roster.