US4125152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale resistant heat transfer surfaces and a method for their preparation
Assignee: Borg Warner Corp
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Filing: 1977-09-19
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Granted: 1978-11-14
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Expires: 1997-09-19
Abstract
Abstract Heat transfer surface of cooling water systems and boilers are made resistant to the deposition of adherent scale by coating with plasma-polymerized fluoroethylene monomer.
Inventors
- 👤 Mark O. Kestner
- 👤 Robert H. Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:02
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/62; B05D5/00; B05D5/08; B05D5/083; C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; B05D2202/00; B05D2401/00; B05D2401/30; B05D2401/33; B05D2506/00; B05D2506/10; B05D2506/15; Y; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
A method for rendering heat transfer surfaces resistant to the deposition of adherent scale consisting of plasma-polymerizing fluoroethylene monomer in the presence of said surfaces, and depositing on said surfaces a fluoropolymer coating.
Claim 2
Independent Claim
33 words
A method for rendering heat transfer surfaces resistant to the deposition of adherent scale consisting of plasma-polymerizing fluoroethylene monomer in the presence of said surfaces, and depositing on said surfaces a fluoropolymer coating.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the coating thickness is less than about 1/10,000 inch.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said fluoroethylene monomer is tetrafluoroethylene.
Claim 5
Dependent Claim
46 words
In a heat exchanger comprising heat transfer fluid conducting means and aqueous heat transfer fluid, the improvement wherein the surfaces of said heat transfer fluid conducting means contacting said aqueous heat transfer fluid are coated to a thickness of less than 1/10,000" with plasma-polymerized fluoroethylene monomer.
Claim 6
Dependent Claim
46 words
In a heat exchanger comprising heat transfer fluid conducting means and aqueous heat transfer fluid, the improvement wherein the surfaces of said heat transfer fluid conducting means contacting said aqueous heat transfer fluid are coated to a thickness of less than 1/10,000" with plasma-polymerized fluoroethylene monomer.
Claim 7
Dependent Claim
12 words
The heat exchanger of claim 4 wherein said fluoroethylene monomer is tetrafluoroethylene.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |