Patent US4888245A successfully refreshed from Google Patents.
US4888245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoroplastic coating with a filler of activated carbon for preventing corrosion
Assignee: W.L. Gore and Associates Inc
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Filing: 1988-03-17
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Granted: 1989-12-19
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Expires: 2008-03-17
Abstract
Abstract A multilayer coating system for protecting metal surfaces comprising a multilayer coating of fluoroplastics in which at least one intermediate layer contains a porous filler, in particular activated carbon.
Inventors
- 👤 Richard Witzko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:53
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/56; B05D7/58; B05D7/14; B05D7/16; B05D7/52; B05D7/54; C; C08; C08K; C08K7/00; C08K7/22; C08K7/24; B05D2506/00; B05D2506/10; B05D5/00; B05D5/08; B05D5/083; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A multilayer coatings system for protecting metal surfaces from corrosion comprising at least one layer of fluoroplastic and activated carbon over a metal surface and at least one layer of fluoroplastic as an outer surface layer.
Claim 2
Dependent Claim
36 words
A multilayer coatings system for protecting metal surfaces from corrosion comprising at least one layer of fluoroplastic and activated carbon over a metal surface and at least one layer of fluoroplastic as an outer surface layer.
Claim 3
Dependent Claim
30 words
A multilayer coatings system for protecting metal surfaces according to claim 1 wherein the fluoroplastic of each layer is a mixture of polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), and perfluoroethylene propylene (FEP).
Claim 4
Dependent Claim
32 words
A multilayer coatings system for protecting metal surfaces according to claims 1 or 2, wherein filling ratios of activated carbon are between 5 and 25 percent by weight of the activate carbon.
Claim 5
Dependent Claim
33 words
A multilayer coatings system for protecting metal surfaces comprising three superimposed layers of a first fluoroplastic layer over the metal surface, an intermediate fluoroplastic layer containing activated carbon, and an outer fluoroplastic layer.
Claim 6
Dependent Claim
33 words
A multilayer coatings system for protecting metal surfaces comprising three superimposed layers of a first fluoroplastic layer over the metal surface, an intermediate fluoroplastic layer containing activated carbon, and an outer fluoroplastic layer.
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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |