Patent US2684015A successfully refreshed from Google Patents.
US2684015A
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US
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Reflecting mirror optical objective
Assignee: Polaroid Corp
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Filing: 1950-04-27
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Granted: 1954-07-20
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Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 David S Grey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:38
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0605; G02B17/061; G02B17/08; G02B17/0804; G02B17/0808; G02B17/0852
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190303058A
Cited
US1967214A
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US2097494A
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US2198014A
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GB538622A
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US2380887A
Cited
US2380888A
Cited
US2490052A
Cited
US2520634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |