![]() 238000006011 modification reaction Methods 0.000 description 3.230000005540 biological transmission Effects 0.000 description 6.230000001702 transmitter Effects 0.000 claims description 5.230000005236 sound signal Effects 0.000 claims description 8.Publication of US20030134666A1 publication Critical patent/US20030134666A1/en Application granted granted Critical Publication of US7103392B2 publication Critical patent/US7103392B2/en Status Expired - Fee Related legal-status Critical Current Adjusted expiration legal-status Critical Links Assignors: FLETCHER, DOUGLAS D., HALL, RONALD W., MEDEK, JAMES C. ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co Priority to US10/050,308 priority Critical patent/US7103392B2/en Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee 3M Innovative Properties Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Hall Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related, expires Application number US10/050,308 Other versions US20030134666A1 Google Patents Wireless intercom systemÄownload PDF Info Publication number US7103392B2 US7103392B2 US10/050,308 US5030802A US7103392B2 US 7103392 B2 US7103392 B2 US 7103392B2 US 5030802 A US5030802 A US 5030802A US 7103392 B2 US7103392 B2 US 7103392B2 Authority US United States Prior art keywords intercom earpiece speaker microphone radio frequency Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US7103392B2 - Wireless intercom system
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