Patent US1100334A successfully refreshed from Google Patents.
Patent US2480728A successfully refreshed from Google Patents.
US2480728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-burning heater
Assignee: Individual
•
Filing: 1945-04-04
•
Granted: 1949-08-30
•
Expires: 1965-04-04
Abstract
No abstract record available.
Inventors
- 👤 Otto C Griewank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:37
CPC Classifications
F; F24; F24C; F24C5/00; F24C5/02; F23; F23D; F23D5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US473858A
Cited
US1452563A
Cited
US1840137A
Cited
US1944593A
Cited
US2091658A
Cited
US2039591A
Cited
US2128155A
Cited
US2136317A
Cited
US2184967A
Cited
US2184653A
Cited
US2257834A
Cited
US2263737A
Cited
US2262922A
Cited
US2375347A
Cited
US2357587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-29 | 1953-02-28 | 1953-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-29 | 1957-02-28 | 1957-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-29 | 1961-02-28 | 1961-08-30 | $7700.00 | Window Closed / Lapsed |