US2680183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enclosed heating element
Assignee: McGraw Electric Co
•
Filing: 1950-02-23
•
Granted: 1954-06-01
•
Expires: 1970-02-23
Abstract
No abstract record available.
Inventors
- 👤 John R Gomersall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:48
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2344908A
Cited
US1032267A
Cited
US1104054A
Cited
US1334850A
Cited
US1395963A
Cited
GB425043A
Cited
US2061516A
Cited
US2150285A
Cited
US2244960A
Cited
US2332392A
Cited
US2464147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |