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124 records (took 0.032 seconds)

    64.
    发明专利
    未知

    公开(公告)号：IT8367956D0

    公开(公告)日：1983-09-15

    申请号：IT6795683

    申请日：1983-09-15

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  C03C13/04 ,  C07C13/04 ,  G02B6/00 ,  C03B

    Abstract: The process of manufacturing optical fibers of extremely low loss in the medium infrared permits the fabrication of glass preforms having as basic materials metal-fluorides obtained from vapor-phase reactants.

    66.
    发明专利
    未知

    公开(公告)号：IT8068946D0

    公开(公告)日：1980-12-19

    申请号：IT6894680

    申请日：1980-12-19

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: B05C3/12 ,  B05D1/18 ,  C03C25/10 ,  C03C25/12 ,  C03C25/18 ,  G02F

    Abstract: A nozzle used in the coating of optical fibers with a protective resin layer comprises an aluminum body split into two symmetrical halves with cavities which upon assembly form a frustoconical funnel terminating at its narrower lower end in a coaxially converging outlet port. The cavities are machined in solid aluminum blocks whereupon each block is anodized in sulfuric acid to form thereon an abrasion-resistant oxide layer with few, small pores which may be sealed by an aftertreatment in hot de-ionized water.

    67.
    发明专利
    未知

    公开(公告)号：DE3669493D1

    公开(公告)日：1990-04-19

    申请号：DE3669493

    申请日：1986-04-10

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： PARISI GIUSEPPE ,  ROBA GIACOMO

    IPC: G02B6/00 ,  C03B37/018 ,  C03C13/04 ,  C03B37/025

    Abstract: The method allows the production of silica and dopant with reactions among gaseous chemical compounds. The optical fibres produced do not present dip and exhibit low attenuation. Carbon dioxide is used as an oxidizer and organometallic aluminum compounds are used to obtain the dopant; silica is obtained from organometallic silicon compounds or silicon tetrachloride.

    69.
    发明专利
    未知

    公开(公告)号：NO158573C

    公开(公告)日：1988-10-05

    申请号：NO843655

    申请日：1984-09-14

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： ROBA GIACOMO

    IPC: C03B37/018 ,  G02B6/00

    Abstract: The process allows a uniform layer of glass particles, forming the preform, to be deposited on the internal wall of a supporting tube rotated around its axis. A suitable relationship is provided to determine the temperature distribution in the deposition zone. The apparatus makes use of different types of heat sources for generating inside the tube a temperature with the distribution required by the process.

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