Patent US2529547A successfully refreshed from Google Patents.
US1498544A
Expired / Lapsed
US
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Electrical selective system
Assignee: AT&T Inc
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Filing: 1920-03-09
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Granted: 1924-06-24
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Expires: 1940-03-09
Abstract
No abstract record available.
Inventors
- 👤 Clarence B Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1927-06-24 | 1927-12-24 | 1928-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-06-24 | 1931-12-24 | 1932-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-06-24 | 1935-12-24 | 1936-06-24 | $7700.00 | Window Closed / Lapsed |