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:
Nov. 04, 1980
Filed:
May. 10, 1978
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A solar heat collecting apparatus which comprises a cylindrical outer member through which solar heat energy may be penetrated, a cylindrical inner member capable of absorbing solar heat energy disposed in said outer member, the inside of said inner member being formed as a passage for a heating medium, and end plates through which the end portions of said inner member are hermetically projected and for hermetically closing the open ends of said outer member, said end plates being provided at the peripheries thereof with annular grooves to be charged with bonding material, said annular grooves having the outer peripheral walls lower than the inner peripheral walls thereof to prevent said bonding material from flowing from the annular grooves toward the centers of said end plates over the inner peripheral walls, thereby to prevent the occurrence of cracks in the solidified bonding material and to subsequently prevent the break of a vacuum formed in the inside of said outer member, whereby the apparatus is improved in reliability and life-time.