Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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US Patent 4950555 - Magnetic recording medium
Estimated Patent Expiration Date:
January 9, 2009Estimated 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.AbstractA magnetic recording medium is disclosed, which comprises a substrate having provided thereon a magnetic substance which is composed of an alloy comprising cobalt, phosphorus and at least one member selected from the group consisting of thallium and elements of group Vb of the periodic table, and optionally at least one member selected from the group consisting of nickel and zinc. The magnetic recording medium exhibits a high coercive force, squareness ratio and a high output with a small noise.Other References
| InventorsAssigneeApplicationNo. 294998 filed on 01/09/1989US Classes:428/900MAGNETIC FEATUREField of Search428/500, Of addition polymer from unsaturated monomers428/900MAGNETIC FEATUREExaminersPrimary: Thibodeau, Paul J.Attorney, Agent or FirmUS Patent References4063000, Process for production of ferromagnetic powderIssued on: 12/13/1977 Inventor: Aonuma , et al.4354909, Process for production of magnetic recording medium Issued on: 10/19/1982 Inventor: Takagi , et al.4382110, Magnetic recording medium Issued on: 05/03/1983 Inventor: Takagi , et al.4517257, Recording media comprising vertical magnetization layers essentially consisting of quaternary Co--Ni--Zn--P alloys Issued on: 05/14/1985 Inventor: Shimizu , et al.4582746, Magnetic recording medium Issued on: 04/15/1986 Inventor: Shirahata , et al.4597801, Silane dispersing agent for magnetic media Issued on: 07/01/1986 Inventor: Stratta , et al.4599280Magnetic recording medium Issued on: 07/08/1986 Inventor: Izumi , et al. Foreign Patent References
International ClassG11B 023/00Foreign Application Priority Data1986-05-27 JP |
