Patent US2607272A successfully refreshed from Google Patents.
US2607272A
Expired / Lapsed
US
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Composite wave plate for light
Assignee: AT&T Inc
•
Filing: 1949-02-11
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Granted: 1952-08-19
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Expires: 1969-02-11
Abstract
No abstract record available.
Inventors
- 👤 Walter L Bond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:58
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2420273A
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US1926716A
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GB378742A
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US2423357A
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US2409853A
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US2412074A
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US2441049A
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US2420252A
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US2442790A
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US2493200A
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US2467325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |