US2520384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace
Assignee: University of Minnesota Twin Cities
•
Filing: 1947-05-23
•
Granted: 1950-08-29
•
Expires: 1967-05-23
Abstract
No abstract record available.
Inventors
- 👤 Edward W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:29
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE264127C
Cited
DE543085C
Cited
US1152050A
Cited
US1166904A
Cited
FR520573A
Cited
US1429925A
Cited
DE384336C
Cited
US1669012A
Cited
US1779571A
Cited
US2057610A
Cited
US2409527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |