Patent US2768916A successfully refreshed from Google Patents.
US2768916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous bluing system for ferrous strip
Assignee: Drever Co
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Filing: 1951-11-13
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Granted: 1956-10-30
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Expires: 1971-11-13
Abstract
No abstract record available.
Inventors
- 👤 Edward J Seabold
- 👤 Louis K Dowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:17
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C23C8/12; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/561; C23C8/14; Y; Y10; Y10S; Y10S165/00; Y10S165/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A BLUING METHOD FOR FERROUS STRIP, COMPRISING IN COMBINATION, CONTINUOUSLY HEATING SAID STRIP IN STRAND FORM TO METAL TREATING TEMPERATURE, CONTINUOUSLY SUPPLYING A CONTROLLED ATMOSPHERE TO SURROUND SAID STRIP DURING SAID HEATING, CONTINUOUSLY REDUCING THE TEMPERATURE OF SAID STRIP TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 750* F. AND ABOUT 1050* F., CONTINUOUSLY SUPPLYING A SUBSTANTIALLY NON-OXIDIZING AND NON-REDUCING ATMOSPHERE SURROUNDING SAID STRIP DURING SAID TEMPERATURE REDUCTION, AND CONTINUOUSLY ADMITTING A PREDETERMINED REGULATED QUANTITY OF UNCOMBINED OXYGEN INTO SAID LAST-MENTIONED ATMOSPHERE ADJACENT SAID STRIP WHILE AT A TEMPERATURE IN SAID TEMPERATURE RANGE, SAID QUANTITY BEING SUFFICIENT TO PRODUCE A SUBSTANTIALLY UNIFORM COATING WEIGHT ON THE SURFACE OF SAID STRIP, AND SUBSTANTIALLY ENTIRELY REACTING SAID OXYGEN WITH SAID STRIP.
Claim 2
Dependent Claim
119 words
A BLUING METHOD FOR FERROUS STRIP, COMPRISING IN COMBINATION, CONTINUOUSLY HEATING SAID STRIP IN STRAND FORM TO METAL TREATING TEMPERATURE, CONTINUOUSLY SUPPLYING A CONTROLLED ATMOSPHERE TO SURROUND SAID STRIP DURING SAID HEATING, CONTINUOUSLY REDUCING THE TEMPERATURE OF SAID STRIP TO A TEMPERATURE IN THE RANGE BETWEEN ABOUT 750* F. AND ABOUT 1050* F., CONTINUOUSLY SUPPLYING A SUBSTANTIALLY NON-OXIDIZING AND NON-REDUCING ATMOSPHERE SURROUNDING SAID STRIP DURING SAID TEMPERATURE REDUCTION, AND CONTINUOUSLY ADMITTING A PREDETERMINED REGULATED QUANTITY OF UNCOMBINED OXYGEN INTO SAID LAST-MENTIONED ATMOSPHERE ADJACENT SAID STRIP WHILE AT A TEMPERATURE IN SAID TEMPERATURE RANGE, SAID QUANTITY BEING SUFFICIENT TO PRODUCE A SUBSTANTIALLY UNIFORM COATING WEIGHT ON THE SURFACE OF SAID STRIP, AND SUBSTANTIALLY ENTIRELY REACTING SAID OXYGEN WITH SAID STRIP.
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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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |