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Patent US2904662A successfully refreshed from Google Patents.
US2904662A
Expired / Lapsed
US
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Circuit controller
Assignee: AT&T Inc
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Filing: 1957-12-30
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Granted: 1959-09-15
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Conrad H F Spring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/16; H01H9/161; H01H9/162; H01H9/18; H01H9/182; H01H2009/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |