Patent US3002733A successfully refreshed from Google Patents.
US3002733A
Expired / Lapsed
US
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Heat treating furnace
Assignee: Sunbeam Equipment Corp
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Filing: 1958-04-09
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Granted: 1961-10-03
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Expires: 1978-04-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:39
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190314256A
Cited
US1847915A
Cited
FR819028A
Cited
US2434169A
Cited
US2610411A
Cited
US2775046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |