Trademark attorney

John W. Calkins

John W. Calkins of Northwestern University (United States) is listed as the attorney or agent of record on 47 trademark filings, as reported by the trademark offices.

Browse filings Get this data via the API

Data current as of May 1, 2026

Filings of record: 47
Still active: 0
Registration rate: 32%
Latest filingFirst in 1993: 2011

Coverage

Where these filings were made

Each mark counts once here: an international registration is grouped with its country designations, not counted once per country.

By office

USPTO47100%

By classA mark can cover several classes

Class 9Computers and Scientific Devices1328%
Class 42Computer and Scientific Services1123%
Class 35Advertising and Business817%
Class 38Telecommunications817%
Class 41Education and Entertainment613%
Class 5Pharmaceuticals511%
Class 40Treatment of Materials511%
Class 1Chemicals36%

+8 more

Activity

Filings per year

New filings of record each year, counting each mark once.

Peak year · 11 filed: 2000
2007 to 2011 · filed: 3
First filing: 1993

Clients

Companies on these filings

Owners on the latest 47 filings of record that Signa links to a company record.

30 more owners in these filings are not linked to a company record.

Filings

Latest filings of record

The most recent applications naming this attorney or agent.

Browse all filings

Mark	Status	Office	Owner	Classes	Filed
THINK BRAVELY	cancelled	USPTO	Northwestern University	41	2011-11-03
CARDIOLOGY SUMMER ACADEMY	abandoned	USPTO	Northwestern University	41	2010-03-04
THE ONCOFERTILITY CONSORTIUM SATURDAY ACADEMY	cancelled	USPTO	Northwestern University	41	2010-03-04
PATHWAYS IN CLINICAL RESEARCH	cancelled	USPTO	Northwestern University	41	2006-06-16
LIV STYCKET	cancelled	USPTO	Livstycket	24, 25, 40, 41, 42	2004-10-18
WILLIE'S WHISKEY RIVER	abandoned	USPTO	Alive Enterprises, Inc.	33	2004-06-10
CHRONOCAINE	abandoned	USPTO	Durect Corporation	5	2004-05-28
BLOCKAIDE/CR	abandoned	USPTO	ADVENTRX Pharmaceuticals, Inc.	5	2003-06-23

API

Get this data via the API

Every number on this page comes from the Signa API. Pull the same records into your own product with one request.

GET/v1/attorneys/{id}
Attorney record, firm and filing stats
GET/v1/attorneys/{id}/analytics
Filings by office, class and year
GET/v1/attorneys/{id}/trademarks
Every trademark the attorney is of record on

Get API key View docs

GET /v1/attorneys/{id}

ID=att_019d1a8a-c013-702e-b874-004245f72008
curl https://api.signa.so/v1/attorneys/$ID \
  -H "Authorization: Bearer $SIGNA_API_KEY"

Response

{
  "id": "att_019d1a8a-c013-702e-b874-004245f72008",
  "object": "attorney",
  "name": "John W. Calkins",
  "firm_name": "NORTHWESTERN UNIVERSITY",
  "country_code": "US",
  "trademark_count": 47
}