Electrostatic resistive stud
US4721255A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Mar 19, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/0533
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fluid stud and resistor design for electrostatic spray guns has a fluid passage which is shaped like a cloverleaf in cross section. By providing this cross-sectional shape, the resistor is allowed to reside in one wall of the fluid stud and run, nearly, the complete length of the stud, thereby providing an increased effective resistor length, thus reducing flash-over and providing a smaller contact wire, thereby reducing capacitance. The design of the fluid needle and electrode is provided so as to reduce the length of the electrode wire, thereby reducing capacitance and allowing an increased diameter wire for increased durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.