TELEVISION PRINCIPLES
nc., 1949. 100 ft., b&w, 16mm. Summary: The basic principles of television. Explains the structure and function of the cathode ray tubes, and shows how the amplitude modulated carrier for the picture and synchronizing pulses is combined with the frequency modulated carrier for the accompanying sound
Registration MP205 No renewal found
- Term began
- 1949-06-15
- Claimant
- DeForest's Training, Inc
- Class
- MP — published motion picture other than a photoplay (numbering series begun Jan. 1950)
- Finding
- no renewal entry found for 1976-1978 in the CCE motion-picture renewal sections or in the Copyright Office renewal records 1978-2025
- In the public domain since
- 1 January 1978 (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 1976 or 1977 volume; volumes searched: 1976, 1977, 1978.
Catalog entry
Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1950, Internet Archive catalogofcopyri341213libr (OCR text), lines 18291–18303.
Training, Inc., 1949. 100 ft., b&w, 16mm. Summary: The basic principles of television. Explains the structure and function of the cathode ray tubes, and shows how the amplitude modulated carrier for the picture and synchronizing pulses is combined with the frequency modulated carrier for the accompanying sound, © DeForest's Training, Inc.; 15Jun49 (in notice: 1948); MP205.
Copies on the Internet Archive
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