GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM AND GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS
This Laos Patent “GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM AND GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS” is a public DIP intellectual-property record, filed by HOYA CORPORATION on 2017-11-14; current status: Registered. Identifiers include application No. P/857; DIP id LAP857; protection kind Patent - PCT National Phase. Key dates: publication 2025-12-19; grant 2025-04-22; expiry reference 2042-10-12. 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 rnedium substrate, which is an amorphous oxide glass, wherein, in terms of mol7o, an SiOz conten…. This prose is informational only and does not constitute legal advice, ownership proof or an infringement opinion.
P/857
Mark
Key facts
- Type
- Patent
- App. no.
P/857- Status
- Registered
- Applicant
- HOYA CORPORATION
- Agent
- Tilleke & Gibbins International Ltd
- Filing date
- 2017-11-14
- Reg. no.
P/857- Publication
- 2025-12-19
- Registration / grant
- 2025-04-22
- Expiry
- 2042-10-12
- Protection kind
- Patent - PCT National Phase
- Gazette
- 301 · 2025-04-25
- Priority
- JP · 2016-221389 · 2016-11-14
- Applicant address
- HOYA CORPORATION · 6- 1 0- I Nishi-Shinjuku, Shinjuku-ku, Tokyo 1608347 JAPAN · JP
- Agent address
- Tilleke & Gibbins International 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
-
Substantive examination
-
Published
-
Granted
Related records
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Abstract
Provided is a glass for magnetic recording rnedium substrate, which is an amorphous oxide glass, wherein, in terms of mol7o, an SiOz content ranges from 45 to 680/o; an AlzOr content ranges from 5 to 20o/o; a total content of SiOz and AlzOl ranges from 60 to 80o/r; a BzO: content ranges from 0 to 5o/o; an MgO content ranges from 3 to 28o/o; a CaO content ranges from 0 to I8%o; a total content of BaO and SrO ranges from 0 to 2o/o; a total content of alkali earth metal oxides ranges from 12 to 30o/o; a total content of alkali metal oxides ranges fi'om 3.5 to l5o/o; and at least one kind selected fi'orn the group consisting of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00Yo, a glass transition temperature is equal to or higher than 625"C; 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 coeffrcient at 100 to 300oC is equal to or more than 48x l0'7 P
Provided is a glass for magnetic recording rnedium substrate, which is an amorphous oxide glass, wherein, in terms of mol7o, an SiOz content ranges from 45 to 680/o; an AlzOr content ranges from 5 to 20o/o; a total content of SiOz and AlzOl ranges from 60 to 80o/r; a BzO: content ranges from 0 to 5o/o; an MgO content ranges from 3 to 28o/o; a CaO content ranges from 0 to I8%o; a total content of BaO and SrO ranges from 0 to 2o/o; a total content of alkali earth metal oxides ranges from 12 to 30o/o; a total content of alkali metal oxides ranges fi'om 3.5 to l5o/o; and at least one kind selected fi'orn the group consisting of Sn oxide and Ce oxide being included, a total content of Sn oxide and Ce oxide ranges from 0.05 to 2.00Yo, a glass transition temperature is equal to or higher than 625"C; 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 coeffrcient at 100 to 300oC is equal to or more than 48x l0'7 P
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