Patent US4558388A successfully refreshed from Google Patents.
US4558388A
Expired / Lapsed
US
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Substrate and substrate holder
Assignee: DKP A Corp OF
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Filing: 1983-11-02
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Granted: 1985-12-10
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Expires: 2003-11-02
Abstract
Abstract A substrate having two parallel planar faces and an edge with a groove is simultaneously coated on both sides in a vacuum chamber. The substrate is raised, lowered and held on edge while the parallel faces are vertically disposed by a blade inserted into the groove so that while the substrate is coated an unobstructed path exists for the coating material to the faces.
Inventors
- 👤 Walter E. Graves, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:08
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/50; G; G11; G11B; G11B5/00; G11B5/84
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A method of simultaneously coating parallel opposite faces of a substrate in vacuo comprising holding the substrate on edge in a vertical plane during the in vacuo coating by inserting a blade in a groove in the edge so that none of the surfaces of the faces is covered by any holding structure and no obstruction is provided by the holding structure between the faces and source means of the coating material.
Claim 2
Independent Claim
72 words
A method of simultaneously coating parallel opposite faces of a substrate in vacuo comprising holding the substrate on edge in a vertical plane during the in vacuo coating by inserting a blade in a groove in the edge so that none of the surfaces of the faces is covered by any holding structure and no obstruction is provided by the holding structure between the faces and source means of the coating material.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the blade holds the substrate so the substrate bears down on the blade.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein the substrate is held only by a single blade.
Claim 5
Dependent Claim
72 words
A magnetic disc comprising a substantially rigid substrate of non-magnetic material, said substrate having two parallel planar faces intersecting a peripheral edge, said edge of the substrate having a groove therein whereby the substrate can be supported by contact with the interior surfaces of said groove, said substrate having a coating of magnetic material on each of said faces, and said coating extends to said edge at all locations around the edge.
Claim 6
Dependent Claim
72 words
A magnetic disc comprising a substantially rigid substrate of non-magnetic material, said substrate having two parallel planar faces intersecting a peripheral edge, said edge of the substrate having a groove therein whereby the substrate can be supported by contact with the interior surfaces of said groove, said substrate having a coating of magnetic material on each of said faces, and said coating extends to said edge at all locations around the edge.
Claim 7
Dependent Claim
18 words
The magnetic disc of claim 4 wherein the groove has a circular root concentric with said peripheral edge.
Claim 8
Dependent Claim
19 words
The magnetic disc of claim 4 wherein the groove has a portion thereof which is generally triangular in cross-section.
References Cited (Backward Citations)
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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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |