Private Tech Inc.

Other

David Seth Dunn

John McKinstry Doyle

Clifford Marcus Owenby

Christopher William Stokes

Stephen James Dowhy

Nicholas John Espinoza

A mobile device performs authentication with blinded tokens and swaps its international mobile subscriber identity (IMSI) value. For authentication with blinded tokens, the mobile device generates a blinded token and provides it to a server to encrypt. To redeem the token, the mobile device unblinds the encrypted blinded token and provides it to the server along with a public key. To complete authentication, the mobile device receives, from the server, a nonce encrypted with the public key and decrypts the nonce with a private key. For swapping its IMSI value, the mobile device retrieves two eSIM profiles with corresponding IMSI values and configures the first of the two profiles as active. In response to a trigger, the mobile device changes the active profile from the first to the second, swaps the first IMSI value with a new IMSI value, and changes the active profile back to the first profile.

Mobile subscriber identity rotation

Blinded token device authentication

A device for adjusting the spring tension in a door closer in situ comprises body having a front side and back side surface. Mounting screw openings are disposed within the body and are positioned at locations corresponding to locations of selected locking screws in the closer used to secure a spring cover. Mounting screws are disposed within respective mounting screw openings. A centrally positioned cavity is disposed within the body and accommodates rotatable placement of an adjustment shaft therein. The adjustment shaft comprises a hexagonal head extending outwardly from the front side surface, and is attached to an adjustment assembly comprising a drive disk extending outwardly from the back side surface of the device. Adjustment pins extend outwardly from the drive disk and are numbered and configured to correspond to adjustment holes in the spring cover. In situ adjustment of the closer is effected by removing selected locking screws, lowering the device into place against the closer and effecting engagement of the mounting screws and adjustment pins with exposed locking screw openings and adjustment holes, respectively, tightening the mounting screws to snugly fit against the closer, loosening the remaining locking screws, rotating the spring cover by rotating the hexagonal head to provide desired degree of spring tension, tightening the remaining locking screws, untightening the mounting screws, removing the device from the closer, and replacing and tightening the removed locking screws.

Door spring adjusting tool

Growing community of inventors

Washington, DC, United States of America

David Seth Dunn