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 with a sensor device patented 1972 by the Wern brothers in its first digital version.                                                                                                        A first patent of interest to mention here was registered 1928 in the US by the Soviet inventor   

Léon Theremin. 

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 assisted 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.



Patent rights are granted in many countries on a multi-purpose safety and security

technology owned by P-Phone Control AB, Stockholm. The technology is now for sale.

Its background and applications are briefly described in the following lines.

The eCall system saves lives by saving time. It is an initiative with the purpose to

bring rapid assistance to motorists involved in a collision anywhere in the European Union.

In case of a crasch, an eCall-equipped car automatically calls the neares emergency center.

In case of panic calls from mobiles, 112 apps can in Sweden and other countries send their

exact position to the nearest emergency center and provide warning notifications in the

occurrence of an accident or a fire in your vicinity.

It is time to include, on a large scale, natural as well as man-made disaster alarms in a

multi-purpose safety and security monitoring system by employing a technology that originates

from the R&D project EU235/P-Phone approved at a ministerial meeting in Vienna 1989.

An original objective of the P-Phone project was to develop a domestic security system for

the millions. Its innovative technology has attracted interests from Electrolux ( for white goods),

from Ericsson (for base stations) and from Scania (for trucks) as well from Nationalmuseum, Moderna Museet  and other art museums. Proof of concepts can be shown.  

The P-Phone technology is unique in making it possible to combine good false alarm protection

with a sure and early alarm function. It can help to save lives by saving time and to reduce costs

as well as to bring new profitable services to the market.

Here is a brief description of a preferred embodiment employing capacitive positioning sensing:

A multi-purpose monitoring system, which is suitable for natural disaster alarms and in which

a telecom network is provided with data processing means arranged to receive warning

signals  from a plurality of geographically dispersed vibrations detectors and to send alarm

messages to a group of receivers.

The detectors are arranged to monitor local capacitances to earth and to send status 

reports on these to the data processing means subsequent to the warning signals and within          a preset time window enabling post-event analysis of local damages before the alarm messages.

Contact persons:

Patent Portfolio

Lars A. Wern:  European Patent Attorney EPI, NIR, SER, SFIR, SIPF, SMS, STAR

Email: law.ppc@gmail.com

Mobile: +46-760 162 260