US3428533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High quality sub-masters and method for producing them
Assignee: Electro Optical Systems Inc
•
Filing: 1964-04-13
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Granted: 1969-02-18
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Expires: 1984-04-13
Abstract
No abstract record available.
Inventors
- 👤 Marlowe A Pichel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:55
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/06; C25D1/10; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; H01Q15/142
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD OF AN OPTICALLY ACCURATE METAL REPLICA MIRROR MASTER OF AN ORIGINAL GLASS MIRROR MASTER, SAID METHOD COMPRISING THE STEPS OF: FORMING A PLASTIC SUBMASTER FROM THE ORIGINAL GLASS MASTER; SENSITIZING THE WORKING SURFACE OF THE SUB-MASTER BY COATING IT WITH AN ELECTRICALLY CONDUCTIVE MATERIAL; ELECTROPLATING A METAL LAYER OVER SAID ELECTRICALLY CONDUCTIVE COATING; MOUNTING A STABLE STRUCTURE ONTO SAID METAL LAYER TO RIGIDIZE ITS SHAPE; SEPARATING SAID RIGIDIZED STRUCTURE FROM THE PLASTIC SUB-MASTER; AND REMOVING THE COATING OF ELECTRICALLY CONDUCTIVE MATERIAL FROM THE METAL LAYER BY DISSOLVING IT IN A SOLVENT WHICH IS SELECTIVE THERETO WITHOUT DISTORTING THE METAL LAYER SURFACE, THEREBY LEAVING THE DESIRED REPLICA MASTER.
Claim 2
Independent Claim
109 words
A METHOD OF AN OPTICALLY ACCURATE METAL REPLICA MIRROR MASTER OF AN ORIGINAL GLASS MIRROR MASTER, SAID METHOD COMPRISING THE STEPS OF: FORMING A PLASTIC SUBMASTER FROM THE ORIGINAL GLASS MASTER; SENSITIZING THE WORKING SURFACE OF THE SUB-MASTER BY COATING IT WITH AN ELECTRICALLY CONDUCTIVE MATERIAL; ELECTROPLATING A METAL LAYER OVER SAID ELECTRICALLY CONDUCTIVE COATING; MOUNTING A STABLE STRUCTURE ONTO SAID METAL LAYER TO RIGIDIZE ITS SHAPE; SEPARATING SAID RIGIDIZED STRUCTURE FROM THE PLASTIC SUB-MASTER; AND REMOVING THE COATING OF ELECTRICALLY CONDUCTIVE MATERIAL FROM THE METAL LAYER BY DISSOLVING IT IN A SOLVENT WHICH IS SELECTIVE THERETO WITHOUT DISTORTING THE METAL LAYER SURFACE, THEREBY LEAVING THE DESIRED REPLICA MASTER.
References Cited (Backward Citations)
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US2865821A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |