US2643320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating element
Assignee: Connecticut Hard Rubber Co
•
Filing: 1950-04-19
•
Granted: 1953-06-23
•
Expires: 1970-04-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Arnold Pfenninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B2203/00; H05B2203/002; H05B2203/004; H05B2203/014; H05B2203/017
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1632651A
Cited
US2251697A
Cited
US2397568A
Cited
US2406367A
Cited
US2496279A
Cited
GB614587A
Cited
US2503457A
Cited
US2540472A
Cited
US2497998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |