Which U.S. Patent, granted in 1969 to George M. Lang, demonstrated the systematic approach to transmission loss using manufactured components?
Answer
US3476209A
The shift toward systematic, engineered acoustic solutions in the mid-20th century is evidenced by patented systems rather than abstract principles. Patent US3476209A, secured by George M. Lang in 1969, is specifically cited as an example of this evolution. It described a defined assembly featuring flexible walls mounted upon a structural frame. This patent signifies the move away from relying on static mass (like a stone wall) toward creating predictable barriers based on manufactured, repeatable components designed to calculate and manage transmission loss.
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