USM Mailbox Patent Information and Licensing


Patent No. US 7,252,221 and others pending.
For More Information or to License this Patent:

February 10th, 2008
Door Swing Guard ™

We would like to inform you of the issuance of USA Patent # 7,252,221 B1. This invention makes many new mailbox designs and material usages possible.

This invention protects mailbox doors, hinges, floors, bodies, and sidewall edges from damages. This is accomplished by controlling the impact forces resulting from the mass of a free swinging door's impacting against other key parts of the mailbox. The greater the mass of the door, the more advantage this device provides. This device limits forces, redirects forces away from vulnerable line and point contact areas on key components, then transfers and dissipates the forces to the sidewalls of the mailbox without consequence. With this device key mailbox components of various designs and materials are far less likely to break, crack, shatter, or simply fallen apart from use.

This device enables manufacturers to fully comply with the preferences for door closure stated in USPS -STD-7B 3.4 Carrier Service Door requirements. "The door must rotate a minimum of 100 degrees when open and it is preferred that the maximum rotation be limited to 120 degrees or less". This device limits the door rotation by allowing the manufacture to control and set the rotation stop point. It can easily and precise be controlled and set to a defined point within a 100 to120 degrees range.

This device: protects the mailbox, extends the life of the mailbox, controls the door rotation precisely to fully meet the requirements and preferences of USPS-STD-7B 3.4. This device generally just makes the mailbox work better and thereby a better product.

We have enclosed a copy of the patent for your convenience. If you have interest in the use of this patent or one of our other patents we invite you to contact us to discuss arrangements.

   
View PDF Sample of Patent

Other awarded Patents for USM Mailboxes

Mailbox with Straps, Rivets, and Cupped Handle PC-2236D.pdf (pdf download)
Mailbox (Gladiator) PC-2238D.pdf (pdf download)
Mailbox (Centurion) PC-2238D.pdf (pdf download)
Weather Barrier Mailbox PC-2238D.pdf (pdf download)