Patent US3785304A successfully refreshed from Google Patents.
Patent US4024546A successfully refreshed from Google Patents.
US4024546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-coated carrier for recordings and process for determining the oxygen-attached aluminum contents in the coating
Assignee: Robert Bosch GmbH
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Filing: 1972-03-02
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Granted: 1977-05-17
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Expires: 1992-03-02
Abstract
Abstract A carrier medium for recording comprises a ribbon of insulating material and a metal coating deposited thereon in a thickness of at least 250 A which coating is adapted to be electrically seared for producing writing trackings. The coating is predominantly composed of vapor deposited aluminum of which at least 15% by weight is in the form of aluminum oxide, aluminum oxide hydrate or a combination of these two compounds. The content of oxygen-attached aluminum in the metallic coating is determined by first measuring the total aluminum contents per surface unit in a definite size specimen of the coating, then placing the specimen into alkali to evolve hydrogen in an amount equivalent to the metallic aluminum present in the coating, whereupon the amount of hydrogen developed is determined by gas chromatography.
Inventors
- 👤 Klaus Brill
- 👤 Eberhard Traub
- 👤 Alfred Ortlieb
- 👤 Wolfgang Grothe
- 👤 Friedrich Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:10
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/24; B41M5/245; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31703; Y10T428/31844; Y10T428/31848
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
A carrier for recordings, particularly for recordings produced by selectively burning away portions of the carrier, comprising a ribbon of insulating material; and a layer for the production of recordings provided on said ribbon and having a minimum thickness of about 250 angstroms, said layer including a minimum of about 15 percent by weight of aluminum in the form of a substance selected from the group consisting of aluminum oxide, aluminum oxide hydrate and mixtures of aluminum oxide and aluminum oxide hydrate, and said layer further including at least one element selected from the group consisting of cobalt, silicon, germanium, chromium and nickel, the remainder of said layer being predominantly metallic aluminum, and the total aluminum content of said layer being a minimum of about 80 percent by weight.
Claim 2
Dependent Claim
129 words
A carrier for recordings, particularly for recordings produced by selectively burning away portions of the carrier, comprising a ribbon of insulating material; and a layer for the production of recordings provided on said ribbon and having a minimum thickness of about 250 angstroms, said layer including a minimum of about 15 percent by weight of aluminum in the form of a substance selected from the group consisting of aluminum oxide, aluminum oxide hydrate and mixtures of aluminum oxide and aluminum oxide hydrate, and said layer further including at least one element selected from the group consisting of cobalt, silicon, germanium, chromium and nickel, the remainder of said layer being predominantly metallic aluminum, and the total aluminum content of said layer being a minimum of about 80 percent by weight.
Claim 3
Dependent Claim
17 words
The carrier of claim 1 wherein said layer contains up to about 1% by weight of cobalt.
Claim 4
Dependent Claim
17 words
The carrier of claim 1 wherein said layer contains up to about 2% by weight of silicon.
Claim 5
Dependent Claim
17 words
The carrier of claim 1 wherein said layer contains up to about 9% by weight of germanium.
Claim 6
Dependent Claim
17 words
The carrier of claim 1 wherein said layer contains up to about 10% by weight of chromium.
Claim 7
Dependent Claim
17 words
The carrier of claim 1 wherein said layer contains up to about 4% by weight of nickel.
Claim 8
Dependent Claim
55 words
The carrier of claim 1 wherein said layer comprises up to about 1 percent by weight of cobalt, up to about 2 percent by weight of silicon, up to about 9 percent by weight of germanium, up to about 10 percent by weight of chromium and up to about 4 percent by weight of nickel.
Claim 9
Dependent Claim
32 words
The carrier of claim 1, wherein said layer consists essentially of said substance, said metallic aluminum and at least one of the elements selected from the group consisting of chromium and nickel.
Claim 10
Dependent Claim
28 words
The carrier of claim 8, wherein said layer comprises up to about 10 percent by weight of chromium and up to about 4 percent by weight of nickel.
Claim 11
Dependent Claim
33 words
The carrier of claim 1, wherein said layer consists essentially of said substance, said metallic aluminum and at least one of the elements selected from the group consisting of cobalt, silicon and germanium.
Claim 12
Dependent Claim
37 words
The carrier of claim 10, wherein said layer comprises up to about 1 percent by weight of cobalt, up to about 2 percent by weight of silicon and up to about 9 percent by weight of germanium.
Claim 13
Dependent Claim
25 words
The carrier of claim 1, wherein said insulating material comprises paper; and further comprising a layer of lacquer arranged intermediate said ribbon and said layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |