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Patent Grant
- When
- 19 February 1878
- Where
- Menlo Park, New Jersey
Edison's phonograph was patented on February 19, 1878, as US Patent 200,521, following earlier announcements and demonstrations.
The patent was granted on February 19, 1878, as US Patent 200,521. This followed Edison's announcement on November 21, 1877, and his first demonstration on November 29, 1877. Menlo Park, New Jersey, is the site of Edison's home and research laboratory, established in 1876, and serves here as institutional context for the inventor's work.
Sources
- Phonograph Wikipedia, revision of 2026-10-04
- Menlo Park, New Jersey Wikipedia, revision of 2026-09-11
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.