Silicon nitride protective coatings for silvered glass mirrors
Patent 4780372 Issued on October 25, 1988. Estimated Expiration Date: 
June 4, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 4, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCombination glass/low temperature deposited Siw Nx Hy O.sub. z Bulk glass having improved properties Protective coating means for articles such as gold-plated jewelry and wristwatch components Patent #: 4517217 InventorsAssigneeApplicationNo. 06/873069 filed on 06/04/1986US Classes:428/428, Next to another silicon containing layer359/883, Laminated or layered mirror support359/884, With selective absorption or transparent overcoating427/397.7, Inorganic silicon-containing coating427/419.7, Boride, carbide, nitride, phosphide, silicide, or sulfide-containing coating428/433, Alloy or free metal428/434, Noble metal containing428/448, As intermediate layer428/450, Next to metal428/469, Next to metal salt or oxide428/472, Refractory metal salt or oxide428/472.1, Formed in situ428/698, Carbide-, nitride-, or sulfide-containing layer428/912.2MIRRORExaminersPrimary: Kittle, John E.Assistant: Schwartz, P. R. Attorney, Agent or FirmInternational ClassesC03C 17/36 (20060101)G02B 1/10 (20060101) G02B 5/08 (20060101) AbstractA protective diffusion barrier for metalized mirror structures is provided by a layer or coating of silicon nitride which is a very dense, transparent, dielectric material that is impervious to water, alkali, and other impurities and corrosive substances that typically attack the metal layers of mirrors and cause degradation of the mirrors' reflectivity. The silicon nitride layer can be deposited on the substrate before metal deposition to stabilize the metal/substrate interface, and it can be deposited over the metal to encapsulate it and protect the metal from corrosion or other degradation. Mirrors coated with silicon nitride according to this invention can also be used as front surface mirrors.Other References
Field of SearchNext to another silicon containing layerMIRROR Noble metal containing Alloy or free metal Next to metal Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product Next to polyester, polyamide or polyimide (e.g., alkyd, glue, or nylon, etc.) Next to aldehyde or ketone condensation product Next to addition polymer from unsaturated monomers Including polyene monomers (e.g., butadiene, etc.) Ester, halide or nitrile of addition polymer Carbide-, nitride-, or sulfide-containing layer Next to metal salt or oxide As intermediate layer Refractory metal salt or oxide | |
