Patent US1533211A successfully refreshed from Google Patents.
US1533211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting device
Assignee: AT&T Inc
•
Filing: 1920-09-09
•
Granted: 1925-04-14
•
Expires: 1940-09-09
Abstract
No abstract record available.
Inventors
- 👤 Paul M Rainey
- 👤 George A Locke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:43
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/46
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1928-04-13 | 1928-10-13 | 1929-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-04-13 | 1932-10-13 | 1933-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-04-13 | 1936-10-13 | 1937-04-14 | $7700.00 | Window Closed / Lapsed |