Mechanical HVAC Consulting Engineering Design and Control

Founded 1963


P-Phone Control AB

PeriProx Control Solutions

Founded 1992

 Stockholm, Sweden.


Brief History   

Wern Inter AB started 1963 in Sweden as the HVAC consulting engineering company  Wern Inter VVS AB founded by Carl R. Wern, a Registered Professional Mechanical Engineer in the State of Michigan, USA. Carl's brother George joined in 1964 the company. Its present name was registered in 1984.


The company has been engaged in various engineering design projects such as                        - Apartment, Hotel, Shopping, Office and Recreational buildings etc.

- Swedish Embassy buildings in Europe, Africa, Asia and North America

- Slide rule design awarded with gold medal to the Wern brothers

- Slide rule calculator design and production for various clients

- Touch control for lighting installations patented in 1972

- Patent license sold 1976 to Ericsson for picture telephony on an ordinary subscriber line.


P-Phone Control AB (PPC) was founded 1992 by Carl together with his brother George in a joint venture agreement with their brother Lars who is a registered European Patent Attorney. PPC is specialized in proximity sensing R&D starting from a sensor device patented 1972 by the Wern brothers in its first digital version following analog versions inspired by the Serbian- American inventor Nikola Tesla. The first patent of interest to mention was registered 1928 in the US by the Soviet inventor Léon Theremin. He developed an electronic musical instrument controlled without physical contact.


The Wern brothers proximity sensor was first used in lighting installations for touch control    and thereafter in art museums as invisible shields preventing exhibited objects from being touched. Today called PeriProx, the technology has been shown applicable for providing enhanced security in 2000 to a Saab car and in 2009 to a Scania truck. Its usefulness for precise proximity sensing was shown in 2010 by Ericsson's Connected Tree at Barcelona, Hannover and Las Vegas international fairs followed by a permanent exhibition at Ericsson Studio in Kista and by a PeriProx patent in 2012 on a monitoring system for prevention   against natural as well as man-made disasters.


Our offer

In possession today of some patents originally filed worldwide by Scania, we want to offer interested companies freedom to use the PeriProx technology with these patents for  developing proprietary artificial intelligence (AI) controlled proximity sensors providing      vehicles and other objects with invisible shields tailored to their periphery.


More about our history and our offer

We offer PeriProx intellectual property rights (IPR) with the necessary transfer of technology    (ToT) to provide enhanced security for lives and goods in trucks, buses, cars, construction machines, etc. Our vision is to make the PeriProx technology accessible and affordable for the millions. We have proven know-how to provide natural as well as man-made objects with our sensor and signaling solutions. Our background comprises heading the R&D project EU235 within the Eureka programme, selling IPR & ToT for white goods applications and for      narrowband image communications, verifying our PeriProx technology as applicable for providing vehicles with enhanced security etc. We have developed and installed proximity warning sensors to protect exhibited objects in museums. When the first car from Saab (fabricated 1947) was in 2000 shown by Stockholm's Modern Museum, one of our sensors  was in less than 15 minutes installed to provide an invisible shield. It is possible to provide in the same  way also even very large vehicles with invisible shields. A trailer would be automatically protected by the same sensor installation.

Patent Portfolio

P1: Multi-Purpose Capacitive sensor - providing proximity sensing for all kinds of applications

P2: Capacitive Sensor System for a Vehicle - providing the entire vehicle with a security shield
P3: Capacitive Sensor System for a Vehicle - providing selected sectors with safety shields
P4: Multi-Purpose Capacitive Sensor - providing proximity sensing for various uses, e g in vehicles
P5: Multi-Purpose Monitoring System Suitable for Natural Disaster Alarms - providing survival guidance 


Contact data:

Administration:   carl.wern@gmail.com

Patent Portfolio: law.ppc@gmail.com