The basic principle underlying patent protection is simple: Only the patentee is allowed to use and practice the invention for commercial exploitation. The duration of a patent is generally 20 years from the date of application. A patent is limited to the territory of the state in which it was granted.
Contrary to widespread conventional wisdom, a patent does not grant the patentee a right to practice the invention, but only to exclude others from doing so. Statutory regulations may interfere with the patentee's freedom to practice his invention.
The patentee's so-called ''freedom-to-operate'' maybe further restricted by the existence of other patents. It often happens that a first patentee holds a patent for a basic invention, e.g., the polymerase chain reaction (PCR) method, which is the subject of further research and development activities resulting in patents for improvements of the basic invention, e.g., diagnostic kits using PCR. If the patent for such an improvement is held by someone other than the first patentee, then the second patentee cannot practice the improvement without permission of the first patentee. Likewise, the first patentee cannot carry out the improvement without an arrangement with the second patentee.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.