Storage bag
US10568807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2014 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Jan 1, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2241/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of making a storage bag comprising the following steps performed in any order: (a) forming a composite tube having an inner surface comprising a higher melting polymer, an outer surface comprising a lower melting polymer, two ends, and a diameter; (b) flattening the tube in a direction perpendicular to the diameter; (c) forming a joint at one of the ends at a temperature between respective melting points of the higher melting polymer and the lower melting polymer; (d) providing a composite sheet having a first side comprising a higher melting polymer and a second side comprising a lower melting polymer; and (e) disposing the composite sheet over the joint such that the first side comprising a lower melting polymer engages the joint and forming a lap seam over the joint at a temperature between respective melting points of the higher melting polymer and the lower melting polymer, and a storage bag made by such method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.