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The following summary describes a Laos Patent titled “GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATES, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM, AND GLASS SPACER FOR MAGNETIC RECORDING/REPRODUCING APPARATUSES”, filed by HOYA CORPORATION on 2017-11-14; current status: Registered. Identifiers include application No. P/665; DIP id LAP665; protection kind Patent - PCT National Phase. Key dates: publication 2022-10-28; grant 2022-10-24; expiry reference 2037-11-14. Classification: C03C 3/085、C03C 3/087、C03C 3/091、G11B 5/73. Inventor(s)/designer(s): HASHIMOTO Kazuaki, SATO Koichi. Abstract hint: Provided is a glass for magnetic recording medium substrates, which is an amorphous oxide glass that has, in mol%, an SiO. Use LaoBiz.com to hop between this IP record, related filings by the same applicant, and the matched company profile when present.
P/665
Mark
Key facts
- Type
- Patent
- App. no.
P/665- Status
- Registered
- Applicant
- HOYA CORPORATION
- Agent
- Tilleke & Gibbins Lao Co., Ltd
- Filing date
- 2017-11-14
- Reg. no.
P/665- Publication
- 2022-10-28
- Registration / grant
- 2022-10-24
- Expiry
- 2037-11-14
- Protection kind
- Patent - PCT National Phase
- Gazette
- 178 · 2022-10-28
- Applicant address
- HOYA CORPORATION · 6-10-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo 1608347 · JP
- Agent address
- Tilleke & Gibbins Lao Co., Ltd · No. 302/1B, 3rd Floor, Vieng Vang Tower, Unit 15, Boulichan Road, Dongpalan Thong Village, Sisattanak District, Vientiane Capital, Lao PDR · LA
- Nice / IPC classes
- C03C 3/085 · C03C 3/087 · C03C 3/091 · G11B 5/73
- Goods / services
- —
Process
Steps follow the current public status-
Filed
-
Formal examination
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Substantive examination
-
Published
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Granted
Related records
Linked from the LaoBiz.com company databaseSimilar Patent
Abstract
Provided is a glass for magretic recording medium substrate, which is an amorphous
oxide glass, wherein, in terms of mol%, ao SiOz content ranges from 45 to 68%; an AlzOr
content ranges from 5 to 20yo; atotal content of SiO2 and AlzO: ranSes from 60 to 80%; a
B2O3 content ranges from 0 to 5%; an MgO content ranges from3 to 28Yo; a CaO content
ratrges from 0 to I 8%; a total content of BaO and Sr0 ranges from 0 to 2%o; a total content of
alkali earth metal oxides ranges fro m 12to 30o/o; a total content of alkali metal oxides ranges
from 3.5 to 15%; and at least one kind selected from the group consisting ofSn oxide and Ce
oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00%, a
glass transition temperature is equal to or higher than 625oC; a Young's modulus is equal to or
more than 83 GPa; a specific gravity is equal to or less than 2.85; and an average linear
expansion coefficient at 100 to 300'C is equal to or more than 48"10-?/oC
Provided is a glass for magnetic recording medium substrates, which is an amorphous oxide glass that has, in mol%, an SiO
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