Patent US2479540A successfully refreshed from Google Patents.
US2479540A
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US
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Method of coating by vacuum distillation
Assignee: American Optical Corp
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Filing: 1942-12-29
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Granted: 1949-08-16
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Expires: 1962-12-29
Abstract
No abstract record available.
Inventors
- 👤 Osterberg Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:30
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2103623A
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US2091031A
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US2143723A
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GB483029A
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US2160981A
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GB492928A
Cited
US2164595A
Cited
US2237328A
Cited
US2230369A
Cited
US2304834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |