US2511540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Room heater
Assignee: McGraw Electric Co
•
Filing: 1946-08-24
•
Granted: 1950-06-13
•
Expires: 1966-08-24
Abstract
No abstract record available.
Inventors
- 👤 Clark M Osterheld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:01
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/014; H05B2203/015; H05B2203/017; H05B2203/026
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1192153A
Cited
US1257339A
Cited
US1416481A
Cited
GB217950A
Cited
US2025586A
Cited
US2122522A
Cited
US2107598A
Cited
US2251697A
Cited
US2345300A
Cited
US2360267A
Cited
US2387995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |