US5012862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic fins for a heat exchanger
Assignee: JW ALUMINUM A CORP OF
•
Filing: 1990-09-12
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Granted: 1991-05-07
•
Expires: 2010-09-12
Abstract
Abstract A coating of a polysulphonic acid is applied to a fin of an aluminum heat exchanger to render the surface hydrophilic.
Inventors
- 👤 Kenneth W. Espeut
- 👤 Leon Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:32
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F2245/00; F28F2245/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
An aluminum fin stock comprising a thin sheet of aluminum, said sheet having one or more sides coated with an aqueous solution of a polysulfonic acid, said solution being subsequently dried.
Claim 2
Dependent Claim
31 words
An aluminum fin stock comprising a thin sheet of aluminum, said sheet having one or more sides coated with an aqueous solution of a polysulfonic acid, said solution being subsequently dried.
Claim 3
Dependent Claim
24 words
An aluminum fin stock as recited in claim 1 in which said aqueous solution of a polysulfonic acid also includes a pH adjusting chemical.
Claim 4
Dependent Claim
33 words
An aluminum fin stock as recited in claim 2 in which said aqueous solution of a polysulfonic acid is applied at an amount of between 0.03 and 0.05 pounds per 3000 square feet.
Claim 5
Dependent Claim
48 words
An aluminum fin stock as recited in claim 1 in which said aqueous solution of a polysulfonic acid comprises between 8.5 and 10.5 parts by weight of polysulfonic acid, between 90.7 and 88.7 parts by weight of water and between 0.7 and 0.9 parts by weight of dimethyl-amino-ethanol.
Claim 6
Dependent Claim
20 words
An aluminum fin stock as recited in claim 1 in which said polysulfonic acid is 2-acrylamido-2 methyl propane sulfonic acid.
References Cited (Backward Citations)
US3929741A
Cited
JPS5415556A
Cited
US4161566A
Cited
US4181773A
Cited
US4637418A
Cited
US4588025A
Cited
US4540510A
Cited
US4664182A
Cited
US4655943A
Cited
JPS61185570A
Cited
JPS61195290A
Cited
US4830101A
Cited
JPS61296083A
Cited
JPS6280494A
Cited
US4726886A
Cited
AU8264387A
Cited
JPS63233300A
Cited
US4806161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |