Patent US4164604A successfully refreshed from Google Patents.
US4164604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leader or trailer tape for a magnetic recording medium
Assignee: Fujifilm Holdings Corp
•
Filing: 1977-09-08
•
Granted: 1979-08-14
•
Expires: 1997-09-08
Abstract
Abstract The present invention relates to a leader or trailer tape for a magnetic recording medium, which comprises a non-magnetic flexible support having a surface roughness of at least 0.15 mu m, at least one side thereof being optionally subjected to a surface activating treatment, and a transparent and electrically conductive metal oxide layer provided thereon.
Inventors
- 👤 Yasuo Tamai
- 👤 Masaaki Fujiyama
- 👤 Hiroshi Amari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/627; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31855
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A leader or trailer tape for a magnetic recording medium comprising a transparent non-magnetic flexible support film of a material from the group consisting of a polymeric cellulose esters, polystyrene, polyesters, polyolefins, polyvinyl resins, and polycarbonates, said film having a surface roughness of 0.15-1.8 μm, and having deposited thereon by vapor deposition in vacuum or high frequency spattering a transparent electrically conductive coating of 10-400 A thickness of an oxide of a metal from the group consisting of indium, gallium, thallium, tin, titanium, vanadium, chromium, molybdenum, tungsten and alloys thereof.
Claim 2
Dependent Claim
90 words
A leader or trailer tape for a magnetic recording medium comprising a transparent non-magnetic flexible support film of a material from the group consisting of a polymeric cellulose esters, polystyrene, polyesters, polyolefins, polyvinyl resins, and polycarbonates, said film having a surface roughness of 0.15-1.8 μm, and having deposited thereon by vapor deposition in vacuum or high frequency spattering a transparent electrically conductive coating of 10-400 A thickness of an oxide of a metal from the group consisting of indium, gallium, thallium, tin, titanium, vanadium, chromium, molybdenum, tungsten and alloys thereof.
Claim 3
Dependent Claim
21 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the polyester is polyethylene terephthalate.
Claim 4
Dependent Claim
22 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the cellulose derivative is cellulose acetate.
Claim 5
Dependent Claim
28 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the non-magnetic flexible support has a thickness of 5 to 200 μm.
Claim 6
Dependent Claim
57 words
The leader and trailer tape for a magnetic recording medium as claimed in claim 1, wherein at least one side of the non-magnetic flexible support is subjected to a surface activating treatment to increase the adhesion of the metal oxide layer thereto, the surface activating treatment being a glow discharge, electron ray, flame or corona discharge treatment.
Claim 7
Dependent Claim
38 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 4, wherein the discharge is carried out in an atmosphere of a gas selected from the group consisting of oxygen, nitrogen, air and argon.
Claim 8
Dependent Claim
26 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the both sides of the support have vapor deposition layers.
Claim 9
Dependent Claim
28 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the back side of the support has a back layer previously provided.
Claim 10
Dependent Claim
28 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the transparent and electrically conductive metal oxide layer consists of indium oxide.
Claim 11
Dependent Claim
29 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the transparent and electrically conductive metal oxide layer consists of indium oxide-tin oxide.
Claim 12
Dependent Claim
40 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 9, wherein the indium oxide-tin oxide layer consists of 95 to 80% by weight of indium oxide and 5 to 20% by weight of tin oxide.
Claim 13
Dependent Claim
79 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 1, wherein the indium oxide layer is formed by evacuating a vacuum vessel to a degree of vacuum of up to 2×10 -5 Torr, introducing oxygen thereinto to adjust the degree of vacuum to 1×10 -4 to 1×10 -2 Torr, evaporating metallic indium in this state to form a lower oxide of indium and then subjecting the lower oxide of indium to a forced oxidation.
Claim 14
Dependent Claim
33 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 12, wherein the forced oxidation is carried out by heating oxidation, anodic oxidation, liquid phase oxidation or discharge oxidation.
Claim 15
Dependent Claim
28 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 13, wherein the discharge oxidation is carried out by glow discharge or electrodeless discharge.
Claim 16
Dependent Claim
34 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 14, wherein the glow discharge is carried out in a degree of vacuum of 1×10 -2 to 6×10 -2 Torr.
Claim 17
Dependent Claim
32 words
The leader or trailer tape for a magnetic recording medium as claimed in claim 14, wherein the electrodeless discharge is carried out in a degree of vacuum of 1 to 5 Torr.
References Cited (Backward Citations)
US2654681A
Cited
GB861710A
Cited
US3142582A
Cited
US3198653A
Cited
US3324280A
Cited
US3561995A
Cited
US3827699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |