Patent US3574012A successfully refreshed from Google Patents.
US3574012A
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US
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Trimetallic masks and method
Assignee: Aerojet Rocketdyne Inc
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Filing: 1969-01-06
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Granted: 1971-04-06
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Expires: 1989-01-06
Abstract
Abstract A TRIMETALLIC MASK ACCORDING TO THIS DISCLOSURE COMPRISES A BASE HAVING COARSE APERTURES FORMED THEREIN. A THIN FILM LAYER OF FINE GRAIN METAL IS BONDED TO THE BASE BY AN INTERMEDIATE THIN FILM OF NOBLE METAL. FINE APERTURES ARE FORMED IN THE FINE GRAIN LAYER. THE MASK IS FORMED BY DEPOSITIONG A THIN FILM OF NOBLE METAL ONTO A SURFACE OF THE BASE AND THEREAFTER DEPOSITING A THIN FILM OF FINE GRAIN METAL ONTO THE NOBLE METAL LAYER. COARSE APERTURES ARE SELECTIVELY ETCHED IN THE BASE AND FINE APERTURES ARE SELECTIVELY ETCHED IN THE FINE GRAIN THIN FILM.
Inventors
- 👤 Mortimer Penberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:09
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/04; C23C14/042; C23F; C23F1/00; C23F1/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/934; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12361; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12868; Y10T428/12951; Y10T428/12958; Y10T428/12972; Y10T428/12979
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |