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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 5768355 | Three-way call detection system Disclosed is a three-way call detection system that uses digital signal processing to identify a third party connection. The disclosed invention operates by establishing a baseline ambient, or background, noise level, and detecting when the signal noise l... | 06/16/1998 |
| 5023904 | Direct telephone dial ordering service A direct telephone dialing ordering system and method is disclosed wherein a calling customer can order products and/or services from a given vendor without voice interchange. The system operates in a local Access and Transport Area (LATA) switching netwo... | 06/11/1991 |
| 4797913 | Direct telephone dial ordering service A direct telephone dialing ordering system is disclosed wherein a calling customer can order products and/or services from a given vendor without voice interchange. The system operates in a Local Access and Transport Area (LATA) switching network which ha... | 01/10/1989 |
