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1993
Bakelite

1994
Chandler Chemistry Laboratory

Pennsylvania home of Joseph Priestley

1995
Atomic weight of oxygen

Chemicals from coal

First nylon plant

Riverside Laboratory

1996
Acrylonitrile production process

Houdry process for gasoline production

Kem-Tone® paint

Williams-Miles History of Chemistry Collection

1997
Aluminum production process

Bromine production process

Gilman Hall

Radiation chemistry commercialized

1998
Calcium carbide and acetylene production process

Fluid bed reactor for gasoline production

Havemeyer Hall

Raman Effect

Synthetic rubber

Tagamet® development process

1999
Penicillin

Physostigmine synthesized

Progesterone synthesis and Mexican steroid industry

Pennsylvania polymer science of Hermann Staudinger

Polypropylene and high-density polyethylene

Rare earth elements

Work of Antoine Lavoisier

2000
Bowood House, site of Joseph Priestley's discovery of oxygen

Edgar Fahs Smith Memorial Collection

Helium in natural gas

Organic free radicals

Polymer science

Protein and nucleic acid chemistry at Rockefeller University

Transcurium elements at E. O. Lawrence Berkeley National Laboratory


* Indicates year that event was designated as a National Historic Landmark