US3741155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for particulate coating of an elongate article
Assignee: 3M Co
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Filing: 1970-08-21
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Granted: 1973-06-26
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Expires: 1990-08-21
Abstract
Abstract A substantially closed shell contains an air pervious liner defining an inner chamber for coating an article with thermoadhesive particles. Air flowing continuously through the liner toward the article in the chamber prevents buildup of the thermoadhesive particles on either the top or sides of the chamber. The chamber may be formed with a pair of openings to permit the entry and exit of pipe to be coated.
Inventors
- 👤 D Hunder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:45
CPC Classifications
B; B05; B05B; B05B14/00; B05B14/40; B05B14/41; B05B14/412; B05B16/00; B05B16/60; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
Apparatus for coating an elongate article such as pipe with thermoadhesive particles comprising a substantially closed outer shell containing an air pervious liner defining an inner coating chamber and an outer chamber between the liner and the shell, openings in the shell for continuous ingress and egress of said elongate article, means for propelling the particles toward the article, and an exhaust port for removing from the coating chamber particles not deposited on the article, wherein the improvement comprises: the air pervious liner provides at least the top and sides of the inner coating chamber and is formed with openings affording continuous entry and exit of the pipe, the exhaust port is directly connected to the inner coating chamber and means for establishing a pressure differential between the entire outer chamber and the entire coating chamber so that air flows continuously through the air pervious liner toward the article, thereby preventing the deposition of substantial amounts of the particles on the top and sides of the coating chamber.
Claim 2
Dependent Claim
168 words
Apparatus for coating an elongate article such as pipe with thermoadhesive particles comprising a substantially closed outer shell containing an air pervious liner defining an inner coating chamber and an outer chamber between the liner and the shell, openings in the shell for continuous ingress and egress of said elongate article, means for propelling the particles toward the article, and an exhaust port for removing from the coating chamber particles not deposited on the article, wherein the improvement comprises: the air pervious liner provides at least the top and sides of the inner coating chamber and is formed with openings affording continuous entry and exit of the pipe, the exhaust port is directly connected to the inner coating chamber and means for establishing a pressure differential between the entire outer chamber and the entire coating chamber so that air flows continuously through the air pervious liner toward the article, thereby preventing the deposition of substantial amounts of the particles on the top and sides of the coating chamber.
Claim 3
Dependent Claim
161 words
Apparatus for coating pipe including a substantially closed outer shell and an air pervious liner defining an inner coating chamber and an outer chamber between the liner and the shell, openings in the shell for continuous ingress and egress of pipe, nozzle means in the inner coating chamber for propelling thermoadhesive particles toward the pipe and an exhaust port for removing by vacuum from the inner coating chamber particles not deposited on the pipe, wherein the improvement comprises: the air pervious liner provides substantially the entire inner coating chamber and is formed with openings affording continuous entry and exit of the pipe, the exhaust port is directly connected to the inner coating chamber, and means establishing a pressure differential between the entire outer chamber and the entire coating chamber so that air flows continuously through the air pervious liner toward the pipe, thereby preventing the deposition of substantial amounts of the particles on the top and sides of the coating chamber.
Claim 4
Dependent Claim
161 words
Apparatus for coating pipe including a substantially closed outer shell and an air pervious liner defining an inner coating chamber and an outer chamber between the liner and the shell, openings in the shell for continuous ingress and egress of pipe, nozzle means in the inner coating chamber for propelling thermoadhesive particles toward the pipe and an exhaust port for removing by vacuum from the inner coating chamber particles not deposited on the pipe, wherein the improvement comprises: the air pervious liner provides substantially the entire inner coating chamber and is formed with openings affording continuous entry and exit of the pipe, the exhaust port is directly connected to the inner coating chamber, and means establishing a pressure differential between the entire outer chamber and the entire coating chamber so that air flows continuously through the air pervious liner toward the pipe, thereby preventing the deposition of substantial amounts of the particles on the top and sides of the coating chamber.
Claim 5
Dependent Claim
40 words
Apparatus as defined in claim 2, wherein a further improvement comprises: the exhaust is located at the bottom of the coating chamber and the floor of the chamber is slanted downwardly toward the exhaust to facilitate removal of nondeposited particles.
Claim 6
Dependent Claim
40 words
Apparatus as defined in claim 2, wherein a further improvement comprises: the air pervious liner has broad semiconductive areas and means are provided for maintaining a negative charge on the nozzle means and on the walls at said semiconductive areas.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |