Patent US1896844A successfully refreshed from Google Patents.
US1896844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustics
Assignee: RCA Corp
•
Filing: 1931-01-28
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Granted: 1933-02-07
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Expires: 1951-01-28
Abstract
No abstract record available.
Inventors
- 👤 Oscar B Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:10
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/99; E04B1/994; E04B1/62; E04B1/74; E04B1/82; E04B2001/8263; E04B1/84; E04B2001/8423; E04B2001/8433; E04B2001/8452
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) | 1936-02-07 | 1936-08-08 | 1937-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-07 | 1940-08-08 | 1941-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-07 | 1944-08-08 | 1945-02-07 | $7700.00 | Window Closed / Lapsed |