Patent US2542800A successfully refreshed from Google Patents.
US2542800A
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Variable timed release for registers controlled by register group busy means
Assignee: AT&T Inc
•
Filing: 1948-10-29
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Granted: 1951-02-20
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Expires: 1968-10-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Dehn
- 👤 Ralph E Hersey
- 👤 Arthur C Mehring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1541386A
Cited
US1509434A
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US1691410A
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US1811146A
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US1729854A
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US1857833A
Cited
US1874684A
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US2486722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |