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Waldo Semon

Waldo Semon, American chemist and engineer (died 1999)

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Born
September 10, 1898
Died
May 26, 1999
Zodiac sign
Virgo
Birth year
1898

About Waldo Semon

Waldo Lonsbury Semon was an American inventor born in Demopolis, Alabama. He is credited with inventing methods for making polyvinyl chloride useful. Semon is best known for plasticizing vinyl, the world's third most used plastic. His doctoral degree was among the first in the nation to be awarded in Chemical Engineering. On December 11, 1935, he created Koroseal from salt, coke and limestone, a polymer that could be made in any consistency.

Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.

The world when Waldo Semon was born

Waldo Semon was born in 1898. The year snapshot below places that birthday in its cultural and historical setting: the music and films people were following, the headlines shaping public life, and the everyday prices families encountered.

Headlines and milestones

  • Top headlineSpanish-American War — US gains territories
  • Technology milestoneMarie & Pierre Curie discover radium
  • World population~1.58B

United States snapshot

  • U.S. leaderWilliam McKinley
  • U.S. population71.0M

1898 versus 2026

These figures put everyday life in Waldo Semon's birth year beside the site's latest United States snapshot.

Measure18982026
Population71.0M341 million

Sources and editorial standards

This profile combines a biographical source with structured birthday and historical context. Sources recorded for this profile: Wikipedia, Encyclopaedia Britannica, Library of Congress, Wikidata. See our editorial policy for sourcing, corrections, and review standards.

Read the source biography on Wikipedia. Wikipedia text is available under the Creative Commons Attribution-ShareAlike License.