Patent US2982819A successfully refreshed from Google Patents.
US2982819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial reverberation apparatus
Assignee: Hammond Organ Co
•
Filing: 1958-10-13
•
Granted: 1961-05-02
•
Expires: 1978-10-13
Abstract
No abstract record available.
Inventors
- 👤 Herbert E Meinema
- 👤 Herbert H Canfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:22
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/10; Y; Y10; Y10S; Y10S84/00; Y10S84/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US354672A
Cited
US1469788A
Cited
US2104811A
Cited
US2230836A
Cited
US2437445A
Cited
US2853145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |