Patent US3160403A successfully refreshed from Google Patents.
US3160403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace construction and method of operating the construction
Assignee: C I HAYES Inc
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Filing: 1961-09-25
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Granted: 1964-12-08
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 William C Diman
- 👤 Martin J Madden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:17
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
IN A METHOD OF HEAT TREATING A PLURALITY OF ARTICLES IN A HEAT TREATMENT FURNACE THAT INCLUDES A FIRST CHAMBER, A SECOND CHAMBER LOCATED DOWNSTREAM OF SAID FIRST CHAMBER AND A COOLING CHAMBER LOCATED DOWNSTREAM OF SAID SECOND CHAMBER, COMPRISING THE STEPS OF MOVING SAID ARTICLES THROUGH SAID CHAMBERS IN SUCCESSIVE ORDER WHILE SIMULTANEOUSLY CIRCULATING A REDUCING ATMOSPHERE IN SAID SECOND FIRST CHAMBER AND AN OXIDIZING ATMOSPHERE IN SAID SECOND CHAMBER, AND COOLING THE HEAT TREATED ARTICLES IN SAID COOLING CHAMBER WHILE CIRCULATING SAID OXIDIZING ATMOSPHERE THEREIN.
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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) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |