Patent US3428533A successfully refreshed from Google Patents.
US3428533A
Expired / Lapsed
US
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High quality sub-masters and method for producing them
Assignee: Electro Optical Systems Inc
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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 09:53
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)
US1612605A
Cited
US1871770A
Cited
US2305050A
Cited
US2865821A
Cited
US2834052A
Cited
US3227634A
Cited
US3285835A
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 |