US2181841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor and motor-operated apparatus
Assignee: US Filter Wallace and Tiernan Inc
•
Filing: 1936-05-18
•
Granted: 1939-11-28
•
Expires: 1956-05-18
Abstract
No abstract record available.
Inventors
- 👤 Charles F Wallace
- 👤 John R Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:12
CPC Classifications
H; H02; H02K; H02K25/00
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) | 1942-11-27 | 1943-05-29 | 1943-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-27 | 1947-05-29 | 1947-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-27 | 1951-05-29 | 1951-11-28 | $7700.00 | Window Closed / Lapsed |