US2452133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phonographic apparatus
Assignee: Dictaphone Corp
•
Filing: 1942-09-18
•
Granted: 1948-10-26
•
Expires: 1962-09-18
Abstract
No abstract record available.
Inventors
- 👤 Richard G Leitner
- 👤 William K Rieber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/08; G11B19/00; G11B19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1424027A
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US1783115A
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US2076298A
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US2348204A
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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) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |