Spray pump
US5025958A · kind A · utility
10Cited by
4References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1990 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Nov 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/1016
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The pump comprises: a main cylinder (24); a main plunger (12) urged by a first spring (62) and extended by a hollow stem (10) and having a valve seat therein; a secondary cylinder (52) comprised within the main cylinder (24); a secondary plunger (64) urged by a second spring (70) having an upper extension (66) and being provided with a cavity (72) which is closed in the proximity of the end (68) engageable with the valve seat; while it is open at the lower end thereof, maintaining communication with the space (54).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.