US2588327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recorder head
Assignee: Dictaphone Corp
•
Filing: 1948-01-31
•
Granted: 1952-03-04
•
Expires: 1968-01-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Roberts
- 👤 Frederick L Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:59
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB315596A
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US1804961A
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US1817021A
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US1823162A
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FR764896A
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US2107050A
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US2163161A
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US2300638A
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US2381673A
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US2376131A
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US2379282A
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US2454425A
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US2391627A
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US2400305A
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US2432444A
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US2426061A
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US2422817A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |