US4171297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-crevice corrosion sealants for metals
Assignee: Hitachi Ltd
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Filing: 1977-09-08
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Granted: 1979-10-16
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Expires: 1997-09-08
Abstract
Abstract Anti-crevice corrosion sealants for metals obtained by adding a mixture of zinc powder and dicyclohexylammonium nitrite powder bound by a vinyl silane coupling agent to a film-forming polystyrene dissolved in a solvent can restrain crevice corrosion occurring at crevices or jointed interior surfaces by filling the sealants into a fine crevice formed between the elements of metal machinery and tools or onto the jointed interior surface of the elements.
Inventors
- 👤 Nobuyoshi Hosaka
- 👤 Tetsuo Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:47
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
An anti-crevice corrosion sealant for metals comprising: (a) 5 to 30% by weight of a material comprising 4 to 15 parts by weight of a mixed powder consisting of 99 to 80% by weight of zinc powder, 1 to 20% by weight of dicyclohexylammonium nitrite powder, and 1 part by weight of a vinyl silane coupling agent, and (b) 95 to 70% by weight of a film-forming polystyrene solution consisting of 5 to 40% by weight of a film-forming polystyrene and 95 to 60% by weight of ethyl acetate, whereby when said anti-crevice corrosion sealant is applied to a crevice, the particles of the zinc powder are encapsulated by polystyrene film, which film has micro-cracks formed therein as the solvent for the polystyrene dries up.
Claim 2
Dependent Claim
125 words
An anti-crevice corrosion sealant for metals comprising: (a) 5 to 30% by weight of a material comprising 4 to 15 parts by weight of a mixed powder consisting of 99 to 80% by weight of zinc powder, 1 to 20% by weight of dicyclohexylammonium nitrite powder, and 1 part by weight of a vinyl silane coupling agent, and (b) 95 to 70% by weight of a film-forming polystyrene solution consisting of 5 to 40% by weight of a film-forming polystyrene and 95 to 60% by weight of ethyl acetate, whereby when said anti-crevice corrosion sealant is applied to a crevice, the particles of the zinc powder are encapsulated by polystyrene film, which film has micro-cracks formed therein as the solvent for the polystyrene dries up.
Claim 3
Dependent Claim
24 words
An anti-crevice corrosion sealant according to claim 1, wherein the zinc powder has a particle size with the range of 0.001 to 0.1 mm.
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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |