2
Plenco. Plastics Engineering CompanySarah M H Brindley March 2003: US 78137391 (1. Chemicals)

3
Plenco. Plastics Engineering CompanyBird & Bird Llp July 1998: NO 000176909

4
Plenco. Plastics Engineering CompanyMarta S Levine February 1994: US 74393171 (1. Chemicals)

5
Plenco. Plastics Engineering CompanyMarta S Levine March 1993: US 74285889 (1. Chemicals)

6
Plenco. Plastics Engineering CompanySmart & Biggar June 1981: CA 0463661