Number | Name | Date | Kind |
---|---|---|---|
1374505 | Hopkinson | Apr 1921 | |
2824336 | Weigold et al. | Mar 1953 | |
2974714 | Kraft | Mar 1961 | |
3364093 | Porter | Jan 1968 | |
3374138 | Porter et al. | Mar 1968 | |
3388024 | Black et al. | Jun 1968 | |
3738893 | Edler | Jun 1973 | |
3740292 | Leblond | Jun 1973 | |
3867229 | Marra | Feb 1975 | |
3909337 | Yabe | Sep 1975 |
Number | Date | Country |
---|---|---|
239897 | Jul 1962 | AUX |
689253 | Jun 1964 | CAX |
Entry |
---|
Whittlington's Dictionary of Plastics, Whittington, Lloyd R. Pub. by Society of Plastics Engineers & Technomic Publishing Co., Inc., 750 Summer St., Stamford, Conn., 06902, Copyright 1968, p. 173. |