US2754967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centripetal classifier
Assignee: Microcyclomat Co
•
Filing: 1952-03-24
•
Granted: 1956-07-17
•
Expires: 1972-03-24
Abstract
No abstract record available.
Inventors
- 👤 Henry G Lykken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:03
CPC Classifications
B; B07; B07B; B07B7/00; B07B7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
AN APPARATUS FOR CLASSIFYING PULVERULENT MATERIAL
Claim 2
Independent Claim
6 words
AN APPARATUS FOR CLASSIFYING PULVERULENT MATERIAL
References Cited (Backward Citations)
US1933606A
Cited
US2206981A
Cited
US2294921A
Cited
US2304264A
Cited
DE694739C
Cited
US2269412A
Cited
US2350737A
Cited
FR1003288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |