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:
Aug. 25, 1987
Filed:
Jun. 10, 1985
Applicant:
Inventors:
Paul R Johannessen, Lexington, MA (US);
Peter V Planck, Sudbury, MA (US);
Assignee:
Megapulse Inc., Bedford, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375 63 ; 455125 ;
Abstract
A dynamic antenna tuning system particularly adapted for VLF frequency-shift (as opposed to on-off) keyed transmitters, employing saturable magnetic switching amplifiers providing variable tuning inductance between the antenna and transmitter and controlled to effect a gradual and not abrupt switching of the radio frequency during on-off transitions to enable narrow VLF frequency spectrum operation.