Patent US3533758A successfully refreshed from Google Patents.
US3533758A
Expired / Lapsed
US
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Ferrous alloy heat storage apparatus
Assignee: Electric Reduction Company of Canada Ltd
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Filing: 1967-04-25
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Granted: 1970-10-13
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Expires: 1987-04-25
Abstract
No abstract record available.
Inventors
- 👤 Edward James Lowe
- 👤 Sidney Benjamin Hartley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:19
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0056; C; C22; C22C; C22C38/00; C22C38/18; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1527165A
Cited
US1690352A
Cited
GB464095A
Cited
US2289365A
Cited
US3109733A
Cited
US3193383A
Cited
GB1034929A
Cited
US3381113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |