Patent US2747855A successfully refreshed from Google Patents.
US2747855A
Expired / Lapsed
US
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Heat treating apparatus
Assignee: Individual
•
Filing: 1951-09-11
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Granted: 1956-05-29
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Expires: 1971-09-11
Abstract
No abstract record available.
Inventors
- 👤 Harold N Ipsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:10
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/63
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1731318A
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US1888960A
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US1979108A
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US2223603A
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US2325677A
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US2269838A
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US2493493A
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US2473445A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |