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. 16, 1982
Filed:
Oct. 10, 1980
Applicant:
Inventor:
Yasuo Takeichi, Ichikawa, JP;
Assignee:
Daido Sangyo Co., Ltd., Chiba, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219523 ; 219278 ; 219381 ; 219536 ; 338229 ; 166 60 ;
Abstract
A preheater is disclosed which can be inserted and withdrawn from a well tube defining a curved passage, without having its heating element damaged, by utilizing the flexibility of a spirally coiled structure having increased stability of shape and excellent capacity of restoring its original shape after elastic deformation.