RADIO RECEPTION
(Radio Electronics. Reel lesson 10) De Forest’s Training, Inc., 1948. 100 feet, b&w, 16mm. Summary: Demonstrates how converted sound waves modulate a radiated carrier at the transmitter, and how the carrier is demodulated at the receiver so that the original signals are reproduced by the loudspeaker
Registration MP3903 No renewal found
- Term began
- 1948-10-01
- Claimant
- De Forest’s Training, Inc
- Class
- MP — published motion picture other than a photoplay (numbering series begun 1946)
- Finding
- no renewal entry found for 1975-1977 in the CCE motion-picture renewal sections
- In the public domain since
- 1 January 1977 (end of the 28th year, no renewal)
A renewal would have appeared in the Copyright Office's renewal registrations 27 to 29 years after the term began. Those volumes are loaded and no matching renewal was found. A work published 1931–1963 that was not renewed entered the public domain at the end of its 28th year.
A renewal had to be filed in the 28th year and would be listed in the 1975 or 1976 volume; volumes searched: 1975, 1976, 1977.
Catalog entry
Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1949, Internet Archive catalogofcopyri331213libr (OCR text), lines 11597–11609.
RADIO RECEPTION. (Radio Electronics. Reel lesson 10) De Forest’s Training, Inc., 1948. 100 feet, b&w, 16mm. Summary: Demonstrates how converted sound waves modulate a radiated carrier at the transmitter, and how the carrier is demodulated at the receiver so that the original signals are reproduced by the loudspeaker. © De Forest’s Training, Inc.; 10ct48; MP3903.
Copies on the Internet Archive
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