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US Patent 701,839 for a windowed envelope Modern envelope with a single window for the recipient address. A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene [1] plastic film) window to allow the recipient's address to be printed on the paper contained within.
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...
It is also known as the window of discourse. The term is named after the American policy analyst and former senior vice president at Mackinac Center for Public Policy , Joseph Overton , who proposed that the political viability of an idea depends mainly on whether it falls within an acceptability range, rather than on the individual preferences ...
The company invented folded paper towels commonly found in public washrooms whereby pulling one paper towel out from the bottom of a stack leaves the whole stack intact. The company also invented molded pulp egg cartons and the window envelope, which was first used by the billing unit of San Francisco-based Pacific Gas and Electric Company (PG&E).
The first is a photo-catalytic effect, in which ultra-violet rays catalyse the breakdown of organic compounds on the window surface; the second is a hydrophilic effect in which water is attracted to the surface of the glass, forming a thin sheet which washes away the broken-down organic compounds.
The Morlet wavelet filtering process involves transforming the sensor's output signal into the frequency domain. By convolving the signal with the Morlet wavelet, which is a complex sinusoidal wave with a Gaussian envelope, the technique allows for the extraction of relevant frequency components from the signal.