What is a seam ripper used for?

What is the characteristics of seam ripper?

A seam ripper is a specialty notion that features a curved blade ending in a sharp point on one side and and a small ball on the opposite edge, to help protect against damaging adjacent fabric. Seam rippers are available in sizes to fit different hands, ranging from 2¾ inches to 6 inches (7–12.7 cm).

Who invented seam ripper?

US patent no. 225700. 1973 Jan 2. Rogers J, inventor; Seam ripper attachment for automatic sewing machine, US patent no.

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