BETHESDA, MD, Acccording to SEC filings, KoolSpan Inc. has completed a $4 million offering of convertible preferred stock, taking in the amount from four investors. The Bethesda-based connector of network devices adds to a $9.5 million round from last June and nearly $15 million prior to that.

KoolSpan, Inc. provides simple secure connectivity solutions that seamlessly unite mission-critical network devices.

KoolSpan's TrustChip simply and intuitively transforms a standard smartphone, or any computing device, into a secure communication device. A purpose-built crypto processor designed into a standard microSD package, the TrustChip makes security an inherent part of the communication experience-as simple as connectivity itself.

KoolSpan's TrustChip delivers a full suite of security services including key management, authentication and encryption. These capabilities are leveraged by application developers and OEMs via the TrustChip Developer Kit.

Because it is deployed in its own optimized hardware environment, KoolSpan's high-performance TrustChip is insulated from threats that can reside in open platform and mobile host devices. This uniquely additive security processor provides a hardware-anchor to secure voice and other applications which harness the TrustChip's power.

KoolSpan was founded in 2001. Tony Fascenda, a serial inventor and entrepreneur with more than a dozen issued patents, created its flagship TrustChip products and novel device-to-device architecture. Prior inventions inspired companies that were later sold to Lotus and Motorola, respectively.