US1536021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step-by-step motor
Assignee: Electric Tachometer Corp
•
Filing: 1922-03-11
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Granted: 1925-04-28
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Expires: 1942-03-11
Abstract
No abstract record available.
Inventors
- 👤 Kolff Petrus Van Santen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:13
CPC Classifications
H; H01; H01H; H01H63/00
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) | 1928-04-27 | 1928-10-27 | 1929-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-04-27 | 1932-10-27 | 1933-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-04-27 | 1936-10-27 | 1937-04-28 | $7700.00 | Window Closed / Lapsed |