Certainteed Corporation

Other

Andrew G Johnson

Husnu M Kalkanoglu

Ming Liang Shiao

Keith C Hong

Anne B Hardy

James A Salvatore

Algae-resistant roofing granules are formed by extruding a mixture of mineral particles and a binder to form porous granule bodies, and algaecide is distributed in the pores. Release of the algaecide is controlled by the structure of the granules.

Algae resistant roofing granules with controlled algaecide leaching rates, algae resistant shingles, and process for producing same

Algae-resistant roofing shingles are formed by extruding a mixture of mineral particles and a binder to form porous granule bodies, and algaecide is distributed in the pores to provide alqae-resistant granules, which are subsequently applied to roofing shingles. Release of the algaecide is controlled by the structure of the granules.

Algae resistant roofing granules with controlled algaecide leaching rates, algae resistant shingles and process for producing same

An electron microscopy coating apparatus and coating methods incorporate a specimen mounting arrangement which is used both for coating specimens which are to be viewed by scanning electron microscopy (SEM) and for coating specimens which are to be viewed by transmitted electron microscopy (TEM) and for coating specimens for the recently developed scanning-transmitted electron microscopy (STEM). The coating apparatus and method includes a hood and a mixer disc for coating by cold cathode sputtering and can also be used (with arc type electrodes in place of the hood and mixer disc) for coating by either charged ion evaporation or straight film evaporation. A biasing direct current provides a differential charge for cold cathode sputtering and charged ion evaporation. For charged ion evaporation the negative lead of the direct current is connected to one electrode of the evaporator and the positive lead of the direct current is connected to the base to provide a differential charge (a negative charge on the evaporated ion and a positive charge on the specimen) to attract the evaporated ions to the specimen.

Growing community of inventors

Barre, MA, United States of America

Andrew G Johnson