Patent US3617331A successfully refreshed from Google Patents.
US3617331A
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Method for manufacture of rotatable variable filter
Assignee: Optical Coating Laboratory Inc
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Filing: 1968-11-12
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Granted: 1971-11-02
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Expires: 1988-11-12
Abstract
Abstract Method for manufacture of a rotatable variable filter by controlling the deposition of a coating material on a substrate by the use of first and second masks in which the first and second masks and the substrate form three elements and in which at least two of the elements are rotated with respect to each other and the third element to cause the material to be deposited upon the substrate so that the optical thickness of the coating material varies with angle through a predetermined angle on the substrate.
Inventors
- 👤 Rolf F Illsley
- 👤 Alfred J Thelen
- 👤 Joseph H Apfel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:29
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; C; C23; C23C; C23C14/00; C23C14/04; C23C14/042; C23C14/044; G02B26/00; G02B26/007; G02B26/008; G02B7/00; G02B7/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A method as in claim 1 together with the step of rotating the first, second and third elements about the source.
Claim 2
Dependent Claim
154 words
In a method for providing a rotatable wedge filter forming at least part of a circle by the deposition of a coating material in a vacuum chamber from a source on a substrate by first and second sector-shaped masks with one of the masks subtending a substantially greater angle than the other mask, comprising the steps of causing the source to produce a coating material in the form of a vapor stream which will impinge upon the substrate, progressively interrupting the deposition of the coating material on the substrate by said first and second masks, said substrate and said first and second masks forming first, second and third elements, the improvement comprising the steps of rotating about a common axis at least two of said elements at differing rates relative to the remaining element and to each other in a predetermined relationship with each of said two elements being continuously rotated in one direction.
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |