No chalk dust now with Prof’s innovation

Chaudhary Devi Lal University’s (CDLU) Computer Science Department has introduced an innovative solution for health issues caused by chalk dust in classrooms. Prof Harish Rohil and his team have developed an automatic chalk duster cleaning device, designed to eliminate the harmful effects of chalk dust, such as infections and respiratory problems, while also maintaining the cleanliness of blackboards. This device ensures that the chalk dust is safely contained and does not cause harm to the users or the environment.

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Prof Rohil’s idea for the device stemmed from a personal health issue he encountered two years ago. He suffered an infection in his fingers, caused by an allergic reaction to chalk dust, which inspired him to create a machine that could prevent dust from spreading when cleaning blackboards. Typically, when using a duster, the chalk dust is shaken out on the floor, causing it to spread and affect both students and teachers. The new device solves this problem by drawing in the chalk dust and collecting it in a box, keeping the dust from escaping.

The device received its patent on February 6, 2025, after a detailed process involving a hearing and approval by the Controller General of Patents, Designs and Trademarks. The university has also provided a grant of Rs 2.70 lakh to further develop and test the device in various schools to ensure its market viability.

Prof Rohil said the special thing about this device is that such a device is not available in the market yet. It is also cost-effective and, after mass production, it will be available for around Rs 300 to 400. Additionally, the device is user-friendly and very easy to use.

The device also has an environmental benefit. The chalk dust contains calcium carbonate, which, when used in moderation, can act as a natural fertiliser for plants, which means that instead of simply disposing of the dust, it can be repurposed to nourish plants and trees.

Prof Rohil and his team, including Dr Narendra Kumar, Dr Manju Rohil and Narendra Dhamu, worked together for about six months to develop the device. They initially used a wooden box model that included a motor, sensor and adapter to collect the dust when the duster was placed inside. The new model will be made using acrylic sheets, combining glass and plastic. It will be available in both AC and DC versions and can last up to 10-12 hours on a single battery charge.

Moving forward, Prof Rohil plans to apply for international patent recognition through the Patent Cooperation Treaty (PCT). If approved, the device will receive patent protection in 158 countries, enabling its widespread use and commercial production.