Patent US3941772A successfully refreshed from Google Patents.
Patent US2098561A successfully refreshed from Google Patents.
US2098561A
Expired / Lapsed
US
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System for producing stereosonic effects
Assignee: RCA Corp
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Filing: 1934-02-09
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Granted: 1937-11-09
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Expires: 1954-02-09
Abstract
No abstract record available.
Inventors
- 👤 Beers George Lisle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:07
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04S; H04S1/00; H04S5/00
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) | 1940-11-08 | 1941-05-10 | 1941-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-11-08 | 1945-05-10 | 1945-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-11-08 | 1949-05-10 | 1949-11-09 | $7700.00 | Window Closed / Lapsed |