ELECTRON THEORY
the central body being the positive nucleus and the outer revolving bodies being the negative electrons. Shows that when the atoms become negatively and positively charged a condition of unbalance exists, and the resulting flow of electrons, which tend to restore a balance, can produce usable energy
Registration MP3900 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 3977–3992.
resembling our solar system, the central body being the positive nucleus and the outer revolving bodies being the negative electrons. Shows that when the atoms become negatively and posi- tively charged a condition of unbalance exists, and the resulting flow of electrons, which tend to restore a balance, can produce usable energy. © De Forest's Training, Inc.; 10ct48; MP3900.
Copies on the Internet Archive
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