Arrangement for multiple custom calling
Patent 4446553 Issued on May 1, 1984. Estimated Expiration Date: 
October 29, 2001. 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.
October 29, 2001. 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.Patent References 3504123 3517135 Memory operation for 3-way communications Apparatus for custom calling features in a telephone system Patent #: 3997731 InventorApplicationNo. 06/316268 filed on 10/29/1981US Classes:379/215.01, Call Waiting370/260, Conferencing370/370, Having space switch as intermediate stage (e.g., T-S-T, T-S-S, or S-S-T)379/202.01, Conferencing379/207.01, Three-way calling379/212.01Call transferExaminersPrimary: Olms, Douglas W.Attorney, Agent or FirmInternational ClassH04Q 11/06 (20060101)AbstractThe arrangement described herein provides for simple control and minimal program impact of a central office switching system for interfacing multiple custom calls. This arrangement employs a few simple trunks connected in a loop around configuration. The arrangement shown considers the establishment of a three way call by a three way calling subscriber who is already engaged as a non-control party in another custom calling subscriber's call waiting call.Other References
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