US4928508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming prelubricated finstock
Assignee: Rio Tinto Alcan International Ltd
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Filing: 1987-05-27
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Granted: 1990-05-29
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Expires: 2007-05-27
Abstract
Abstract A prelubricated finstock is described for making heat exchanger fins. The lubricant is water-soluble so that it can be removed from the heat exchanger fins by aqueous means. According to the process, a coating of the water-soluble lubricant is applied to a continuous strip of aluminum alloy finstock. This coating is dried and the coated strip is coiled for shipping and storage. When used, the prelubricated finstock is uncoiled and passed through a finpress to form the heat exchange fins. The lubricant is removed from the fins by aqueous means at any stage after the finpress.
Inventors
- 👤 Gregory J. Courval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:20
CPC Classifications
C; C10; C10M; C10M107/00; C10M107/20; C10M107/30; C10M107/32; C10M107/34; B; B21; B21D; B21D53/00; B21D53/02; B21D22/00; B21D22/20; B21D22/201; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10N; C10N2040/00; C10N2040/20; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/015; C10N2050/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A process which comprises: (a) forming a coating of water soluble lubricant on a continuous strip of aluminum alloy finstock having a thickness of 75 to 150 microns, said lubricant having a solubility of at least 50 gpl and a viscosity of at least 50 mPas, and coiling the coated strip to form a prelubricated coil having an Olsen cup rating of greater than 0.30, (b) subsequently uncoiling the prelubricated coil and passing the coated strip through a forming device to form aluminum alloy heat exchange fins, and (c) thereafter removing the lubricant from the heat exchange fins by applying an aqueous medium thereto.
Claim 2
Dependent Claim
104 words
A process which comprises: (a) forming a coating of water soluble lubricant on a continuous strip of aluminum alloy finstock having a thickness of 75 to 150 microns, said lubricant having a solubility of at least 50 gpl and a viscosity of at least 50 mPas, and coiling the coated strip to form a prelubricated coil having an Olsen cup rating of greater than 0.30, (b) subsequently uncoiling the prelubricated coil and passing the coated strip through a forming device to form aluminum alloy heat exchange fins, and (c) thereafter removing the lubricant from the heat exchange fins by applying an aqueous medium thereto.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein the lubricant is ethoxylated castor oil.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |