US3713873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic spray coating methods
Assignee: Gillette Co LLC
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Filing: 1970-11-18
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Granted: 1973-01-30
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Expires: 1990-11-18
Abstract
Abstract A method of electrostatic spray coating an article includes the steps of establishing an electrostatic field having an average gradient less than 10 kilovolts per centimeter between a mist generator and the article to be coated; and maintaining a quiescent zone in the atmosphere adjacent the article to be coated, the distance of the article from the output of the mist generator being sufficient to permit substantial dispersion of the spray particles. Particles of less than 10 microns in size are continuously generated and they are accelerated under the influence of the electrostatic field for deposit on the surface to be coated. The electrostatic field carries the particles through the quiescent atmosphere so that a substantial portion of the mist particles which would not otherwise have been deposited on the article and liquid are deposited on the article. Relative movement between the mist generator and the article surface transverse to the general direction of mist particle movement during particle deposition is continuous.
Inventors
- 👤 F Fish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:02
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/08; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
216 words
A method of electrostatic spray coating an article comprising the steps of continuously generating a mist of particles of less than 10 microns in size by aspirating coating material from a supply with a downwardly directed gas stream so that the aspirated particles are directed in a downward direction, the heavier particles returning to the supply and the lighter particles flowing upwardly through an outlet port, establishing an electrostatic field having an average gradient less than 10 kilovolts per centimeter between said mist generator outlet port as one electrode and the article to be coated as a second electrode; maintaining a quiescent zone in the atmosphere adjacent the article to be coated, the distance of the article from the output of the mist generator being sufficient to permit substantial dispersion of the spray particles that pass through said outlet port; accelerating said particles under influence of said electrostatic field For deposit on the surface to be coated, said electrostatic field carrying said particles through said quiescent atmosphere so that a substantial portion of the mist particles which would not otherwise have been deposited on said article are deposited on said article, and effecting continuous relative movement between said mist generator and the article surface transverse to the general direction of mist particle movement during particle deposition.
Claim 2
Independent Claim
216 words
A method of electrostatic spray coating an article comprising the steps of continuously generating a mist of particles of less than 10 microns in size by aspirating coating material from a supply with a downwardly directed gas stream so that the aspirated particles are directed in a downward direction, the heavier particles returning to the supply and the lighter particles flowing upwardly through an outlet port, establishing an electrostatic field having an average gradient less than 10 kilovolts per centimeter between said mist generator outlet port as one electrode and the article to be coated as a second electrode; maintaining a quiescent zone in the atmosphere adjacent the article to be coated, the distance of the article from the output of the mist generator being sufficient to permit substantial dispersion of the spray particles that pass through said outlet port; accelerating said particles under influence of said electrostatic field For deposit on the surface to be coated, said electrostatic field carrying said particles through said quiescent atmosphere so that a substantial portion of the mist particles which would not otherwise have been deposited on said article are deposited on said article, and effecting continuous relative movement between said mist generator and the article surface transverse to the general direction of mist particle movement during particle deposition.
Claim 3
Dependent Claim
23 words
The method as claimed in claim 1 wherein the coating material is in the form of a dispersion of solids in a liquid.
Claim 4
Dependent Claim
27 words
The method as claimed in claim 1 wherein said step of generating said particles imparts a velocity to said particles of less than two meters per second.
Claim 5
Dependent Claim
63 words
The method as claimed in claim 1 wherein said outlet port is so spaced from the blade edges that the angular difference between the length of the outlet port and the length of the article surface to be coated is less than arc tan 0.1 so that the coating material moves along substantially parallel paths from the outlet port to said article surface.
Claim 6
Independent Claim
255 words
The method of applying a shave facilitating coating to razor blades which comprises the steps of: disposing a multiplicity of razor blades in a stack with their sharpened edges aligned parallel with one another, said edges together defining a plane; providing a dispersion of coating material; continuously generating a mist of particles of less than 10 microns in size from said dispersion of coating material by aspirating material from said dispersion with a downwardly directed gas stream so that the aspirated particles are directed in a downward direction, the heavier particles returning to said dispersion and the lighter particles flowing upwardly through an outlet port, said outlet port facing said plane; establishing an electrostatic field having an average gradient in the range of 4-9 kilovolts per centimeter between said mist generator outlet port as one electrode and said stack of razor blades as a second electrode; maintaining a quiescent zone in the atmosphere adjacent said stack, the distance of said stack from the output of the mist generator being sufficient to permit substantial dispersion of the spray particles; accelerating said particles under the influence of said electrostatic field for deposit on the edges of said blades, said said electrostatic field carrying said particles through said quiescent atmosphere so that a substantial portion of the mist particles which would not otherwise have been deposited on said blade edges are deposited thereon; and effecting continuous relative movement between said mist generator and said blade stack transverse to the general direction of mist particle movement during particle deposition.
Claim 7
Independent Claim
255 words
The method of applying a shave facilitating coating to razor blades which comprises the steps of: disposing a multiplicity of razor blades in a stack with their sharpened edges aligned parallel with one another, said edges together defining a plane; providing a dispersion of coating material; continuously generating a mist of particles of less than 10 microns in size from said dispersion of coating material by aspirating material from said dispersion with a downwardly directed gas stream so that the aspirated particles are directed in a downward direction, the heavier particles returning to said dispersion and the lighter particles flowing upwardly through an outlet port, said outlet port facing said plane; establishing an electrostatic field having an average gradient in the range of 4-9 kilovolts per centimeter between said mist generator outlet port as one electrode and said stack of razor blades as a second electrode; maintaining a quiescent zone in the atmosphere adjacent said stack, the distance of said stack from the output of the mist generator being sufficient to permit substantial dispersion of the spray particles; accelerating said particles under the influence of said electrostatic field for deposit on the edges of said blades, said said electrostatic field carrying said particles through said quiescent atmosphere so that a substantial portion of the mist particles which would not otherwise have been deposited on said blade edges are deposited thereon; and effecting continuous relative movement between said mist generator and said blade stack transverse to the general direction of mist particle movement during particle deposition.
Claim 8
Dependent Claim
60 words
The method as claimed in claim 5 wherein said outlet port is so spaced from the blade edges that the angular difference between the length of the outlet port and the length of the blade edge is less than arc tan 0.1 so that the coating material moves along substantially parallel paths from the outlet port to said blade edges.
Claim 9
Dependent Claim
27 words
The method as claimed in claim 5 wherein said step of generating said particles imparts a velocity to said particles of less than 2 meters per second.
Claim 10
Dependent Claim
23 words
The method as claimed in claim 5 wherein the coating material is in the form of a dispersion of solids in a liquid.
Claim 11
Dependent Claim
24 words
The method as claimed in claim 8 wherein said particles flow through said port at a velocity of less than two meters per second.
Claim 12
Dependent Claim
15 words
The method as claimed in claim 8 wherein said coating material is a fluorocarbon telomer.
Claim 13
Dependent Claim
17 words
The method as claimed in claim 10 including the step of preheating said stack of razor blades.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |