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US2043416A - Process of silencing sound oscillations - Google Patents

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Search within the title, abstract, claims, or full patent document: You can restrict your search to a specific field using field names. Use TI= to search in the title, AB= for the abstract, CL= for the claims, or TAC= for all three. For example, TI=(safety belt). Search by Cooperative Patent Classifications (CPCs): These are commonly used to represent ideas in place of keywords, and can also be entered in a search term box. If you're searching forseat belts, you could also search for B60R22/00 to retrieve documents that mention safety belts or body harnesses. CPC=B60R22 will match documents with exactly this CPC, CPC=B60R22/low matches documents with this CPC or a child classification of this CPC. Keywords and boolean syntax (USPTO or EPO format): seat belt searches these two words, or their plurals and close synonyms. "seat belt" searches this exact phrase, in order.

US2043416A - Process of silencing sound oscillations - Google Patents Process of silencing sound oscillations Download PDF Info Publication number US2043416A US2043416A US714582A US71458234A US2043416A US 2043416 A US2043416 A US 2043416A US 714582 A US714582 A US 714582A US 71458234 A US71458234 A US 71458234A US 2043416 A US2043416 A US 2043416A Authority US United States Prior art keywords sound oscillations microphone loudspeaker sound wave Prior art date 1933-01-27 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and

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