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Patent US2722992A successfully refreshed from Google Patents.
US2722992A
Expired / Lapsed
US
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Rapping device
Assignee: Research Corp
•
Filing: 1954-02-10
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Granted: 1955-11-08
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Expires: 1974-02-10
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Roberts
- 👤 David A Tripp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:44
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/74; B03C3/76; B03C3/766
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE469697C
Cited
US1600496A
Cited
DE450391C
Cited
US2392088A
Cited
US2525325A
Cited
US2518995A
Cited
US2552771A
Cited
GB697359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |