We started out with three each of three different types of plants: one member of each set was given water that had been boiled on a gas stove, water that had been boiled in a microwave oven, or water that had not been boiled at all.
Drug patent protection: How long is long enough? A recent Senate committee hearing on Bill S-17, Parliament's effort to comply with international trade rules by extending pharmaceutical patent protection to 20 years, inadvertently opened the door to a broader investigation of the inner workings of the country's pharmaceutical patent legislation.
U.S. copyrights span the author's life plus 70 years. A patent is a grant of property right of an invention for a limited time (20 years under U.S. law), and it includes the right to exclude others from making, selling, or importing the invention. A trademark is a distinctive word, name, or symbol used to indicate and distinguish the source of goods.