Hestad; Alfred M.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hestad; Alfred M..The latest application filed is for "music on hold for key systems".
- Hestad; Alfred M. - Phoenix AZ
- Hestad; Alfred M. - Chicago IL
| Patent | Date |
|---|---|
| Music on hold for key systems Grant 4,588,865 - Hestad May 13, 1 | 1986-05-13 |
| Telephone call routing and charging system Grant 4,410,765 - Hestad , et al. October 18, 1 | 1983-10-18 |
| Speaker phones Grant 4,346,261 - Hestad , et al. August 24, 1 | 1982-08-24 |
| Dialing system Grant 4,232,200 - Hestad , et al. November 4, 1 | 1980-11-04 |
| Direct Inward Dialing Trunk Circuit Grant 3,748,396 - Hestad , et al. July 24, 1 | 1973-07-24 |
| Toll Restrictor Circuit Grant 3,692,951 - Hestad , et al. September 19, 1 | 1972-09-19 |
| Conference Call Circuit Grant 3,660,610 - Hestad , et al. May 2, 1 | 1972-05-02 |
| Trunk Allotter Grant 3,655,918 - Marbury , et al. April 11, 1 | 1972-04-11 |
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