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:
Oct. 21, 1997
Filed:
Dec. 29, 1995
Applicant:
Inventor:
Richard Frank Hill, Chagrin Falls, OH (US);
Assignee:
Advanced Ceramics Corporation, Lakewood, OH (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16J / ; C04B / ;
U.S. Cl.
CPC ...
277227 ; 277D / ; 501 96 ;
Abstract
Boron nitride formed to an optimum density and composition of soluble borates and oxygen forms a material which deforms under pressure and reforms to make a very low permeability seal. The boron nitride seal is formed by precompacting a boron nitride powder having a soluble borate concentration of between 0.5 and 1.90% by weight, hot pressing the powder to a density of about 1.85 g/cc and machining the hot pressed powder into a seal of desired shape.