The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 1999
Filed:
May. 19, 1997
Applicant:
Inventors:
Stephen T Wellinghoff, San Antonio, TX (US);
Sumner A Barenberg, Chicago, IL (US);
Hong Dixon, San Antonio, TX (US);
Joel J Kampa, Burnett, TX (US);
Assignee:
Bernard Technologies, Inc., Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A01N / ; A01N / ; A01N / ; A01N / ;
U.S. Cl.
CPC ...
424405 ; 424408 ; 424409 ; 424420 ; 424421 ; 424497 ; 424498 ; 424501 ; 424502 ; 25218721 ; 25218723 ; 25218821 ; 514772 ; 5147723 ;
Abstract
A powder for sustained release of a gas including a hydrophilic core, a hydrophobic layer on an outer surface of the hydrophilic core, and particles in contact with the hydrophobic layer. The hydrophobic layer contains an acid releasing agent. The particles contain an anhydrous material capable of binding with water. The core, the particles, and the hydrophobic layer are substantially free of water, and the core is capable of generating and releasing a gas after hydrolysis of the acid releasing agent.