US3799438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispensing and spraying apparatus and method
Assignee: Baxter International Inc
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Filing: 1972-12-01
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Granted: 1974-03-26
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Expires: 1992-12-01
Abstract
Abstract A method and apparatus for air stream dispensing and spraying of pulverulent material with less noise is described using means for developing two separate outward air flows from a dispensing gun. One flow is of a high velocity and the second flow is of a lower velocity. After both flows leave the gun, the lower velocity flow surrounds the high velocity flow (e.g., as concentric annular flow about a columnar flow). Pulverulent material is fed to the lower velocity flow to be entrained therewith and transferred, at least in part, downstream from the gun to the higher velocity flow and thus finely dispensed over a desired area or product.
Inventors
- 👤 W Shockley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:35
CPC Classifications
B; B05; B05B; B05B13/00; B05B13/02; B05B7/00; B05B7/14; B05B7/1481; B05B7/1486
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A method for dispensing and spraying pulverulent material on a product to be coated thereby using a spray gun from which the material is sprayed comprising the step of developing a first high velocity flow in one direction, developing a second lower pressure flow surrounding the first flow in the same direction, while introducing pulverulent material to the second flow to become initially entrained with said second flow whereby part of said entrained material is thereafter transferred to the first flow downstream from the end of the gun apparatus. Amend the following claim:
Claim 2
Dependent Claim
168 words
Apparatus for spraying pulverulent material on a product in accordance with the method of claim 1, said apparatus comprising an elongated barrel having a central bore throughout, first means closing said barrel at one end and providing a first fluid line within at least the length of said bore, said means adapted for communication with a source of fluid high pressure to develop said first high velocity flow therefrom, means providing a second fluid line throughout at least a portion of the length of said bore, connector means mounted in said barrel in fluid communication with said second fluid line, said connector adapted for communication with a second source of fluid under lower pressure to develop the said second flow therefrom, a chamber within said bore, and means for delivering said pulverulent material to said chamber whereupon because of pressure conditions created by movement of said second flow said material moves through said chamber, toward and into entrainment with said second flow upon exiting said second fluid line.
Claim 3
Dependent Claim
14 words
The apparatus of claim 2 wherein said first line provides a columnar fluid flow.
Claim 4
Dependent Claim
38 words
The apparatus of claim 2 wherein said first fluid line provides a columnar fluid flow and said second fluid line provides an annular fluid flow which envelops substantially said columnar fluid flow after exiting said first fluid line.
Claim 5
Dependent Claim
34 words
The apparatus of claim 2 wherein said first means includes a connector at said one barrel end and an elongated conduit, means to support said conduit within said bore and concentrically of said barrel.
Claim 6
Dependent Claim
49 words
The apparatus of claim 5 wherein said means providing a second fluid line includes a second conduit, and means to support said second conduit within said bore and in concentric relation to said elongated conduit thereby to form an annular space, said annular space defining said second fluid line.
Claim 7
Dependent Claim
25 words
The apparatus of claim 6 wherein said connector means mounted in said barrel is disposed between said second fluid line and said barrel end connector.
Claim 8
Dependent Claim
53 words
The apparatus of claim 6 wherein said second fluid line terminates within said bore and the velocity of said second fluid flow within said second fluid line is greater than the velocity of said second fluid flow without said second fluid line thereby to create a relative negative pressure condition within said chamber.
Claim 9
Dependent Claim
23 words
The apparatus of claim 2 wherein said chamber is isolated from said second fluid flow at the entrance to said second fluid line.
Claim 10
Dependent Claim
67 words
The method of applying powder to plastic gloves using a substantially closed chamber comprising the steps of a. providing a plurality of gloves; b. moving the gloves into the chamber; c. dispensing powder as the pulverulent material, in accordance with the method of claim 1, into the chamber, while d. maintaining the gloves in the chamber for a sufficient tiMe to coat them with the dispensed powder.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |