Patent US2587434A successfully refreshed from Google Patents.
US2587434A
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US
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Assignee: EMDE PRODUCTS Inc
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Filing: 1946-06-15
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Granted: 1952-02-26
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Expires: 1966-06-15
Abstract
No abstract record available.
Inventors
- 👤 Earl T Boaden
- 👤 Joseph L Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:19
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/64; G03C; G03C11/00; G03C11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2432515A
Cited
US1274804A
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US1617304A
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US1904318A
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US2148124A
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US2256399A
Cited
US2227973A
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US2291173A
Cited
US2323532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |