US3707407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-stage forming operations
Assignee: BOC Group Ltd
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Filing: 1970-04-21
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Granted: 1972-12-26
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Expires: 1990-04-21
Abstract
Abstract A HIGH SPEED MULTI-STAGE FORMING OPERATION WITH INTERSTAGE HEAT ANNEALING WHICH INCLUDES THE STEPS OF IMMERSING, AT LEAST PART OF A FORMED WORKPIECEIN COOLANT LIQUID, HEATING SAID PART WHILE IMMERSED UNTIL IT REACHES THE ANNEALING TEMPERATURE, AND MOVING THE WORKPIECE WHILE STILL IN THE COOLANT LIQUID TOWARDS THE NEXT FORMING STAGE WITH THE HEATED PART REMAINING IMMERSED IN THE LIQUID FOR A TIME SUFFICIENT TO COOL THE HEATED PART BELOW THE TEMPERATURE AT WHICH SIGNIFICANT OXIDATION CAN OCCUR.
Inventors
- 👤 Erich R Spielmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/13; B; B21; B21D; B21D22/00; B21D22/20; B21D22/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |