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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 |
| 7575065 | Metal detector with excavation tool A hand-held metal detector and soil excavation device useful for locating and retrieving metallic objects concealed in soil or other materials. The device includes a housing with a hand-grip portion and an elongated probe portion. There is an excavation tool connect... | 08/18/2009 |
| D583261 | Hand held metal detector | 12/23/2008 |
| D533792 | Metal detector | 12/19/2006 |
| D513706 | Tactical hand-held metal detector | 01/24/2006 |
| D497559 | Tactical hand-held metal detector | 10/26/2004 |
| 5969528 | Dual field metal detector A metal detector has multiple transmit and receive coils for producing multiple detection fields. In one embodiment, a transmit coil is combined with two receive coils in a configuration that enables the detector to generate two detection fields, one bein... | 10/19/1999 |
| 5786696 | Metal detector for identifying target electrical characteristics, depth and size A metal detector utilizes digital signal processing and a microprocessor to process buffers of information which is received at a periodic rate. Both high and low gain phase quadrature and in-phase signals are provided via a multiplexer to an analog-to-di... | 07/28/1998 |
| 5721489 | Metal detector method for identifying target size A metal detector utilizes digital signal processing and a microprocessor to process buffers of information which is received at a periodic ram. Both high and low gain phase quadrature and in-phase signals are provided via a multiplexer to an analog-to-dig... | 02/24/1998 |
| 5148151 | Metal detector having target characterization and search classification A metal detector is provided with circuitry for producing a plurality of vector signals derived from a target signal. Each of these vector signals corresponds to a phase characteristic of target signals. These vector signals define phase ranges which corr... | 09/15/1992 |
| 5138262 | Metal detector having detachable battery and speaker housing A hobby-style metal detector includes a two-piece stem interconnected by a hand grip and provided with an arm rest. A search coil is positioned at the lower end of the first section of the stem and an electronic housing is mounted on the first stem sectio... | 08/11/1992 |
| 4709213 | Metal detector having digital signal processing A metal detector circuit includes a transmit coil (12) and a receive coil (56) arranged in a balanced induction configuration in an electromagnetic field. The receive signal from the receive coil (56) is input to electronic switches (146, 148) which recei... | 11/24/1987 |
| 4700139 | Metal detector circuit having selectable exclusion range for unwanted objects A metal detector circuit of the balanced induction type is utilized to detect hidden metal objects. A receive signal is provided with two fixed concurrent phase shifts relative to the transmit signals. Each of the phase shifted receive signals is synchron... | 10/13/1987 |
| 4488115 | Low battery voltage indicator circuit for a metal detector A metal detector is disclosed which has a transmit coil, a receive coil, and circuit means for detecting metal objects due to a change in the magnetic coupling between the coils. Circuit board arrangement techniques are disclosed which enable the close pl... | 12/11/1984 |
| 4423377 | Compact metal detector of the balanced induction type A metal detector is disclosed which has a transmit coil, a receive coil, and circuit means for detecting metal object due to a change in the magnetic coupling between the coils. Circuit board arrangement techniques are disclosed which enable the close pla... | 12/27/1983 |
| 4398104 | Low drift tuning circuit A low drift rate tuning circuit (10) is operated in conjunction with a feedback network (36). An operational amplifier (12) is connected to first and second power supply buses (18, 20). The negative input terminal (16) of the amplifier is connected to the... | 08/09/1983 |
| 4334192 | Metal detector circuit having automatic tuning with multiple rates A metal detector (10) is disclosed which has a transmit coil (48) and a receive coil (150) for detecting a metal object due to a change in the magnetic coupling between the coils (48, 150). The metal detector (10) has a plurality of operating modes and fo... | 06/08/1982 |
| 4334191 | Metal detector circuit having momentary disabled output A metal detector (10) is disclosed which has a transmit coil (48) and a receive coil (150) for detecting a metal object due to a change in the magnetic coupling between the coils (48, 150). The metal detector (10) has a plurality of operating modes and fo... | 06/08/1982 |
| 4303879 | Metal detector circuit with mode selection and automatic tuning A metal detector (10) is disclosed which has a transmit coil (48) and a receive coil (150) for detecting a metal object due to a change in the magnetic coupling between the coils (48, 150). The metal detector (10) has a plurality of operating modes and fo... | 12/01/1981 |
