US3525795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric furnace and tubular heating element for use therewith
Assignee: C I HAYES Inc
•
Filing: 1968-04-29
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Granted: 1970-08-25
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Expires: 1988-04-29
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Westeren
- 👤 William H Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:19
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/32; F; F27; F27D; F27D11/00; F27D11/02; H05B3/10; H05B3/12; H05B3/14; H05B3/145; H05B3/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |