# US 4,398,888 A · Molecular model for chemistry

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- Number: US 4,398,888 A
- Document ID: US4398888A
- Status: Granted
- Kind: A
- Application number: 06/320,615
- Filed: 1981-11-12
- Granted: 1983-08-16
- Earliest claimed: 1980-01-08
- Assignees: Tacoma Products, Inc.
- Inventors: Stephen D. Darling; Aloysius A. Jendrisak; David J. Bokmiller
- Web page: https://patentgrep.com/patent/US4398888A

## CPC

- G09B 23/26: for molecular structures; for crystallography
- G09B: EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS (devices for psychotechnics or for testing reaction times A61B5/16; games, sports, amusements A63; projectors, projector screens G03B)

## Abstract

A molecular model building set for the formation of models of molecules and compounds primarily in the field of organic chemistry is disclosed. The set includes dimensionally accurate model building members (10, 60) that are rotatable about their axes, and can be interconnected and/or interlocked to form specific molecular models. Model building members depicting a double molecular bond (80) and a triple molecular bond (90) are also provided and can be interconnected and/or interlocked with the model building members (10, 60). All of the aforementioned model building members (10, 60, 80 and 90) are formed from a polypropylene copolymer material resulting in the members being inherently flexible while retaining sufficient rigidity to depict strain in molecular bonding. Because of this flexibility, the rotatability of the members, and the manner in which the members can be interconnected and/or interlocked, models of all known molecules and compounds in the field of organic chemistry can be formed.

## Claims

### Claim 1

A molecular model building member comprising a first end portion, a second end portion, and two arms connecting said first end portion and said second end portion, each of said two arms being substantially symmetrical about its longitudinal axis, said first end portion and said second end portion each having an opening formed therein to receive another molecular model building member to form a model of a molecule, each of said first and second end portions having a projection formed thereon oppositely directed from said opening formed therein, said opening being provided with inwardly extending lips at the entrance thereto for engagement with the projection provided on another molecular model building member to interlock with said another molecular model building member when received within the opening adjacent said inwardly extending lips.