Patent US2200351A successfully refreshed from Google Patents.
US2200351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Business dictating system
Assignee: C W B DEV CO
•
Filing: 1938-11-23
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Granted: 1940-05-14
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Expires: 1958-11-23
Abstract
No abstract record available.
Inventors
- 👤 Cecil L Whitehead
- 👤 Ray M Chenoweth
- 👤 Emmett M Irwin
- 👤 Richard H Duval
- 👤 Walter P Huntley
- 👤 Bruce H Rule
- 👤 George E Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:25
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-05-14 | 1943-11-13 | 1944-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-14 | 1947-11-13 | 1948-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-14 | 1951-11-13 | 1952-05-14 | $7700.00 | Window Closed / Lapsed |