Seat cushion for wheelchairs
US5513899A · kind A · utility
64Cited by
26References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1993 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Sep 29, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61G5/1043
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A filled envelope for use with a shaped tray in a wheelchair comprises upper and lower elastomeric elements. The elements have seals about their edges to create a finite volume. The volume is filled with a fill material which comprises petrolatum and hollow glass spheres. The volume of petrolatum comprising the fill material is not substantially greater than the volume of the interstitial spaces of a quantity of hollow glass spheres alone. The envelope also has additional seals which separate the envelope into quadrants to improve the stability of the cushion to the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.