US2771055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for coating optical interference layers
Assignee: Technicolor Corp
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Filing: 1952-04-25
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Granted: 1956-11-20
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Expires: 1972-04-25
Abstract
No abstract record available.
Inventors
- 👤 Donald H Kelly
- 👤 Jr Frank C Rock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; C; C23; C23C; C23C14/00; C23C14/04; C23C14/042; C23C14/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |