Sankar B Narayan

US Patent:

RE347655, Oct 25, 1994

Filed:

Nov 2, 1988

Appl. No.:

7/265905

Inventors:

Jerry L. Alexander - St. Paul Park MN
Sankar B. Narayan - White Bear Lake MN
Sten R. Gerfast - Mendota Heights MN
Charles E. Nelson - Roseville MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

G11B 585
G11B 584

US Classification:

156160

Abstract:

Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in radial tension and stretched across the base portion by adhering the film to attachment surfaces 48 and 36 near the inside and outside diameters respectively. The SD is annealed twice during manufacture to relieve stress in the stretched film 14. This annealing results in SD essentially free from track anisotropy and stress distribution anisotropy in the plane of the disk. As a result, data tracks are more stable than in previous SD, track density can be greater, and the SD is generally more reliable.

US Patent:

53566645, Oct 18, 1994

Filed:

Jun 11, 1993

Appl. No.:

8/075779

Inventors:

Sankar B. Narayan - White Bear Lake MN
William T. Fay - St. Paul MN
Billy L. George - Hudson WI
Christine A. Sobon - Roseville MN
Mark H. Kayser - Woodbury MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B05D 700

US Classification:

427186

Abstract:

A method of inhibiting algae growth on an asphalt shingle surface exposed to varying humidity using a blend of copper-containing algae-resistant granules and non-algae-resistant granules. The copper-containing algae-resistant granules comprise a substrate granule having at least one inner ceramic coating layer comprising cuprous oxide and a seal coating having a thickness covering the inner layer and which is at time t. sub. o devoid of copper.

US Patent:

49376918, Jun 26, 1990

Filed:

Apr 22, 1988

Appl. No.:

7/185059

Inventors:

Sankar B. Narayan - White Bear Lake MN
Felix P. Lau - Austin TX
Takehiko Saito - Yokohama, JP

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

G11B 5012

US Classification:

360 9701

Abstract:

A drive for a recording disk includes a drive motor and a head transport mounted on a chassis which has a coefficient of expansion equal to that of the disk to reduce tracking errors caused by differential expansion of the chassis and the disk due to environmental changes.

US Patent:

RE331872, Mar 27, 1990

Filed:

Nov 2, 1988

Appl. No.:

7/265906

Inventors:

Jerry L. Alexander - St. Paul Park MN
Sankar B. Narayan - White Bear Lake MN
Sten R. Gerfast - Mendota Heights MN
Charles E. Nelson - Roseville MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

G11B 582

US Classification:

428 65

Abstract:

Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in radial tension and stretched across the base portion by adhering the film to attachment surfaces 48 and 36 near the inside and outside diameters respectively. The SD is annealed twice. [. duringmanufacture. ]. . Iadd. during manufacture. Iaddend. to relieve stress in the stretched film 14. This annealing results in SD essentially free from track anisotropy and stress distribution anisotropy in the plane of the disk. As a result, data tracks are more stable than in previous SD, track density can be greater, and the SD is generally more reliable.