Patent US2528444A successfully refreshed from Google Patents.
US3387952A
Expired / Lapsed
US
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Multilayer thin-film coated substrate with metallic parting layer to permit selectiveequential etching
Assignee: AT&T Inc
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Filing: 1964-11-09
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Granted: 1968-06-11
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Expires: 1984-11-09
Abstract
No abstract record available.
Inventors
- 👤 Chapelle Edward A La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:49
CPC Classifications
H; H01; H01B; H01B1/00; C; C23; C23F; C23F1/00; C23F1/02; H01C; H01C17/00; H01C17/06; H01C7/00; H01G; H01G4/00; H01G4/40; H10; H10N; H10N97/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10S428/926; Y10S428/9335; Y10S428/938; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12396; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12736; Y10T428/12743; Y10T428/12986
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3256588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |