MUMBAI, India, Jan. 23 -- Intellectual Property India has published a patent application (202511126844 A) filed by Chandigarh University, Mohali, Punjab, on Dec. 15, 2025, for 'sound-based liquid-level indicator cups for visually impaired individuals.'
Inventor(s) include Mr. Shaman Sharma; and Dr. Deepak Kumar.
The application for the patent was published on Jan. 23, under issue no. 04/2026.
According to the abstract released by the Intellectual Property India: "The present invention relates to a passive, non-electronic acoustic device designed to assist visually impaired individuals in detecting safe liquid fill levels during pouring. The invention comprises a hollow conical insert equipped with a spiral acoustic channel and a whistle slot positioned near a predetermined fill height. As liquid is poured into a cup containing the insert, air flows through the spiral pathway, generating a characteristic resonant sound. When the rising liquid reaches the whistle slot, the airflow becomes obstructed, producing a distinct audible cue such as a whistle, tone drop, or sound termination indicating that the cup is nearing its safe capacity. Constructed from food-grade, heat-resistant materials, the device is reusable, washable, and compatible with hot and cold beverages. The device operates entirely without batteries or electronics, ensuring durability, low maintenance, and universal usability. The invention enables visually impaired users to pour liquids independently, safely, and hygienically while preventing spills and accidental burns."
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