A patent is a legal document giving the patent owner certain exclusive rights to his/her invention for a limited time. Patents are an excellent source of information on new technology, trends in technological development, and specific products or innovations.
Google Patents covers the entire collection of granted patents and published patent applications from the USPTO, EPO, and WIPO. US patent documents date back to 1790, EPO and WIPO to 1978. Google features the full text of pre-1976 USPTO patents, but be aware that this text was generated with an Optical Character Recognition (OCR) program and may contain errors.
Critical data on inorganic and organic compounds and pure substances. Features physical, thermodynamic, mechanical, and other key properties. Originally published from 1926-1930 for the National Research Council, now available in full-text searchable electronic format.
Originally published by Smithsonian Institution Press in 1954, this classic reference source comprises 901 tables of general interest to scientists and engineers, and of particular interest to those involved with physics in its larger sense.