It adds on the patent awarded on march 7th, 2023.
Date of patent : March 28th, 2023
Patent number : 11614584
Inventors : Suresh Venkatesan, Los Gatos CA (USA); Yee Loy Lam, Singapore (SG)
Loopback waveguide
https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/11614584