Digital Signal Processing Sine Wave Inverters is an Indian Patent Office record, grant 241612. Application 722/DEL/2003, filed 2003-05-26. Listed assignee/patentee: Su-Kam Power Systems. Technology category: Power Electronics. IPO prosecution status: Granted.

Source table: solarmanofindia.com/patents (77 Su-Kam filings + 25 Su-Vastika filings). This index does not invent chemistries and does not claim a grant vanished from the register the day CIRP began.

Su-Kam rows here are a historical docket. The source page states those grants are not in force today because renewal fees were not paid after 2019 — later lapse, not a CIRP-day deletion. How the going-concern programme was filed is this essay.