US2500790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating element
Assignee: Catalyst Research Corp
•
Filing: 1946-02-20
•
Granted: 1950-03-14
•
Expires: 1966-02-20
Abstract
No abstract record available.
Inventors
- 👤 Owen G Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:33
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/16; A; A47; A47J; A47J36/00; A47J36/24; A47J36/30; F; F24; F24V; F24V30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US847668A
Cited
US1417075A
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US1434538A
Cited
GB190411468A
Cited
US802256A
Cited
US1573872A
Cited
US2020292A
Cited
US2384278A
Cited
US2388466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |