Patent US3531574A successfully refreshed from Google Patents.
US3531574A
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Heat treating apparatus
Assignee: International Standard Electric Corp
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Filing: 1968-06-05
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Granted: 1970-09-29
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Expires: 1988-06-05
Abstract
No abstract record available.
Inventors
- 👤 Henley Frank Sterling
- 👤 Edward Harold Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:02
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/42; F; F27; F27B; F27B14/00; F27B14/06; F27B14/061; F27B14/063; F27B14/08; F27B14/10; H05B6/22; H05B6/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3223519A
Cited
US3461215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |