Tension Envelope CORP
At a glance
EmployeesNot reported
In business since1886
HeadquartersKansas City, MO
US patents21
SAM.gov UEITBTYTQM9RKH4
CAGE code35SN8
Incorporated inMO
- bagging machines
- pharmacy automation equipment
- fitPACK500™
- HPS-300
- Pregis SX™
- Pregis MAX™
- Pregis MAX-PRO™
- SP600
- SP900
Named on the company’s own website, read JUL 29, 2026
Supplier designations
For Profit OrganizationManufacturer of Goods
Self-certified by the company in its SAM.gov registration
Patents
21 US patents granted 1976–2007, none of them in the five years to SEP 2025, including 2 design patents.
Handling 15Other consumer goods 1Audio-visual technology 1Textile and paper machines 1Machine tools 1
- Envelope with multiple pocketsUS D554701 · granted NOV 6, 2007
- Envelope having improved overlap profileUS 7,172,107 · granted FEB 6, 2007
- Remailable envelope and method for making a remailable envelope from a single blankUS 5,967,403 · granted OCT 19, 1999
- Limited pocket envelopeUS 5,927,592 · granted JUL 27, 1999
- Envelope with dual pocketsUS 5,678,754 · granted OCT 21, 1997
Newest 5 shown · Granted to Tension Envelope Corporation · PatentsView (USPTO), data through SEP 30, 2025 · CC BY 4.0
Their plants
2 FACILITIES| Facility | City | State | Employees | Status |
|---|---|---|---|---|
| Tension Envelope Company | Oakland | CA | — | UNVERIFIED |
| Tension Envelope CORP | Kansas City | MO | — | ACTIVE |
WARN Act notices
- Plant closing notice effective OCT 30, 2020 · 97 employees · Temecula, Riverside County, CA
Filed with the state under the federal WARN Act · WARN Act notices feed, CC BY 4.0
Compiled from federal records — EPA, OSHA, SAM.gov and the U.S. Census — and from the company’s own website. Federal source data is public domain. Each plant’s page names the source of every field.