Patent 4894841 Issued on January 16, 1990. Estimated Expiration Date: June 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A direct-sequence digital spread spectrum modem in which the given functions are implemented by software algorithms utilizing a microprocessor architecture. The modem is especially effective for telesurveillance, teledetection, telemonitoring, telecontrol and telecommunications generally.
Alta Frequenza, Dec. 1988, AEI, vol. LVII-N 10, International Journal in Telecommunications and Related Technologies Focus on Satellite Communication, From R & D Laboratories, A Low Bit Rate Spread Spectrum Modem for Satellite Communications, pp. 591-601-Ital