Patent US2551838A successfully refreshed from Google Patents.
US2551838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system for centrifugals
Assignee: Western States Machine Co
•
Filing: 1947-06-21
•
Granted: 1951-05-08
•
Expires: 1967-06-21
Abstract
No abstract record available.
Inventors
- 👤 Richard J Huser
- 👤 Anthony H Stuhlreyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:07
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/166; B; B04; B04B; B04B9/00; B04B9/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1866499A
Cited
US2175864A
Cited
US2152562A
Cited
US2148320A
Cited
US2280916A
Cited
US2338053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |