US4383644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the electrostatic spraying of electrically conductive paint
Assignee: Akzo NV
•
Filing: 1981-02-20
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Granted: 1983-05-17
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Expires: 2001-02-20
Abstract
Abstract The invention relates to a process and apparatus for the electrostatic spraying of electrically conductive paint. Paint free of electric charge is intermittently fed from a main supply system to a buffer supply vessel, from which the paint is intermittently fed to a spray paint supply vessel which contains electrically charged paint. The paint in the buffer supply vessel is already electrically charged prior to the replenishing of the spray paint supply vessel from the buffer supply vessel. The paint in the buffer supply vessel is intermittently electrically charged and discharged.
Inventors
- 👤 Albertus C. Spanjersberg
- 👤 Hans G. Mink
- 👤 Johannes H. M. Barwegen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:15
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/16; B05B5/1608; B05B5/1616; B05B5/1625; B05B5/1641; B05B5/1633
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
133 words
In a process for the electrostatic spraying of an electrically conductive liquid coating material wherein the liquid to be sprayed is intermittently fed while free of electric charge from a main supply system via a first outlet valve to a buffer supply vessel and intermittently fed from the buffer supply vessel via a second outlet valve to a second vessel which contains a supply of liquid to be sprayed and is continuously electrically charged during operation, the latter vessel being connected to at least one spray unit for spraying the liquid, the main supply system being electrically insulated from the spray liquid supply vessel, the improvement which comprises electrically charging the liquid material in the buffer supply vessel before said second outlet valve is opened and after said first outlet valve is closed.
Claim 2
Dependent Claim
133 words
In a process for the electrostatic spraying of an electrically conductive liquid coating material wherein the liquid to be sprayed is intermittently fed while free of electric charge from a main supply system via a first outlet valve to a buffer supply vessel and intermittently fed from the buffer supply vessel via a second outlet valve to a second vessel which contains a supply of liquid to be sprayed and is continuously electrically charged during operation, the latter vessel being connected to at least one spray unit for spraying the liquid, the main supply system being electrically insulated from the spray liquid supply vessel, the improvement which comprises electrically charging the liquid material in the buffer supply vessel before said second outlet valve is opened and after said first outlet valve is closed.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the coating material is a paint.
References Cited (Backward Citations)
FR62866E
Cited
US3122320A
Cited
DE2019466A1
Cited
US3893620A
Cited
US3933285A
Cited
US3892357A
Cited
US4017029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |