Patent US2620987A successfully refreshed from Google Patents.
US2620987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air swept partitioned tube mill
Assignee: Individual
•
Filing: 1949-04-27
•
Granted: 1952-12-09
•
Expires: 1969-04-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:21
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/04; B02C17/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE294677C
Cited
US1609298A
Cited
US1591941A
Cited
US1610345A
Cited
US1606545A
Cited
US1589740A
Cited
US2351870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |