Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caribonum Ltd
Original Assignee
Caribonum Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caribonum LtdfiledCriticalCaribonum Ltd
Priority to ES0240755ApriorityCriticalpatent/ES240755A1/en
Publication of ES240755A1publicationCriticalpatent/ES240755A1/en
Duplication method, characterized in that a main sheet containing an inverted positive and practically colorless of a writing to be duplicated, positive inverted comprising a colorless and acid-sensitive ink derivative, is subjected to pressure contact with a copy sheet containing an acidic substance to reveal the dye derivative, by which a faint copy of the writing is obtained on the copy paper, and this is then exposed to a sufficient heat source so that a heat formation reaction develops between the derivative of the dye and the acid substance, practically immediately. (Machine-translation by Google Translate, not legally binding)
ES0240755A1958-03-151958-03-15Duplication procedure. (Machine-translation by Google Translate, not legally binding)
ExpiredES240755A1
(en)
A transmitter layer sheet for the manufacture and regeneration of reproducible image forms of inverted image. (Machine-translation by Google Translate, not legally binding)
Procedure for manufacturing a transparent acetate-plastic cellular film, which allows to register sounds on photographs, printed or printed papers and other flat surfaces (Machine-translation by Google Translate, not legally binding)
Improvements in the process of obtaining paper sheets for copies, which allows to obtain several simultaneous copies without using paper carbon. (Machine-translation by Google Translate, not legally binding)
Procedure for the obtaining and copies on paper sinintervention of simped papers interpreted (Machine-translation by Google Translate, not legally binding)