Patent US2561298A successfully refreshed from Google Patents.
US2561298A
Expired / Lapsed
US
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Impulse transmitter for automatic telephone systems
Assignee: Individual
•
Filing: 1948-01-30
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Granted: 1951-07-17
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Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Vanheerswynghels Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:41
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR733549A
Cited
US2072572A
Cited
US2134626A
Cited
GB491755A
Cited
US2253650A
Cited
US2276954A
Cited
US2341305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |