Patent US2420638A successfully refreshed from Google Patents.
US2420638A
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Signaling generator mechanism
Assignee: GREAT AMERICAN IND Inc
•
Filing: 1944-04-15
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Granted: 1947-05-13
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Expires: 1964-04-15
Abstract
No abstract record available.
Inventors
- 👤 Reinhard K Hellmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:46
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |