US4554025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing built-up layers of organic coatings
Assignee: Air Products and Chemicals Inc
•
Filing: 1985-03-18
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Granted: 1985-11-19
•
Expires: 2005-03-18
Abstract
Abstract The removal of paint from a support device for a product in a paint finishing operation is improved by using a support device with a critical surface tension such that paint adheres to the surface, yet readily fractures and debonds when treated with a cryogenic liquid. The paint is then removed by contacting the cryogenically treated support device with a non-metallic, non-silica base solid, gas or liquid with sufficient force to effectively remove the paint.
Inventors
- 👤 Thomas W. Burke
- 👤 Robert A. Welch
- 👤 Kevin S. Schmoyer
- 👤 Bernard D. Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:12
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B08; B08B; B08B7/00; B08B7/0064; B08B7/0092; B44; B44D; B44D3/00; B44D3/16; Y; Y10; Y10S; Y10S241/00; Y10S241/37
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
A continuous, on-line process for removing layers of paint from a support device for a product in a paint finishing operation, which comprises: (a) cryogenically treating said support device having a critical surface tension between about 15 to 25 dynes/cm, after a build-up of paint has occurred on said support device, said cryogenic treatment being sufficient to embrittle the paint; and (b) subsequently removing the paint from said cryogenically treated support device using a gas or liquid blast free of any solid, abrasive particles.
Claim 2
Dependent Claim
84 words
A continuous, on-line process for removing layers of paint from a support device for a product in a paint finishing operation, which comprises: (a) cryogenically treating said support device having a critical surface tension between about 15 to 25 dynes/cm, after a build-up of paint has occurred on said support device, said cryogenic treatment being sufficient to embrittle the paint; and (b) subsequently removing the paint from said cryogenically treated support device using a gas or liquid blast free of any solid, abrasive particles.
Claim 3
Dependent Claim
33 words
The process in accordance with claim 1 wherein an abhesive material having a critical surface tension between about 15 to 25 dyne/cm is applied to the support device prior to applying the paint.
Claim 4
Dependent Claim
21 words
The process in accordance with claim 1 wherein the build-up of paint on the support device is less than 0.01 inch.
Claim 5
Dependent Claim
19 words
The process in accordance with claim 1 wherein the support device is cryogenically treated with a liquid nitrogen spray.
Claim 6
Dependent Claim
19 words
The process in accordance with claim 1 wherein the cryogenically treated support device is contacted with an air blast.
Claim 7
Dependent Claim
22 words
The process in accordance with claim 5 wherein the paint is selected from the group consisting of: alkyd-urea, acrylic, alkyd-melamine or polyester.
Claim 8
Dependent Claim
41 words
The process in accordance with claim 1 which further comprises treating said support device, prior to applying the paint, with a substance selected from the group consisting of: polytetrafluoroethylene; a nickel, chromium and perfluoroalkoxy polymer; or a nickel plate/fluorinated ethylene-propylene copolymer.
Claim 9
Dependent Claim
21 words
The process in accordance with claim 1 wherein the paint is removed from the cryogenically treated support device at ambient temperatures.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |