US3608344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hot working of copper
Assignee: Van Straaten Chemical Co
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Filing: 1969-05-14
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Granted: 1971-09-28
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Expires: 1989-05-14
Abstract
Abstract THIS IMPROVEMENT IN THE ART OF HOT WORKING COPPER AND COPPER ALLOYS IN THE PRESENCE OF AN OXYGEN-CONTAINING ENVIRONMENT TO MINIMIZE OR ELIMINATE THE PROBLEMS ASSOCIATED WITH OXIDE FORMATION ON THE SURFACE THEREOF AT ELEVATED TEMPERATURES COMPRISES CONTACTING THE STOCK SUBSTANTIALLY CONTINUOUSLY DURING THE HOT WORKING THEREOF WITH AN AQUEOUS SOLUTION CONTAINING AMMONIUM CHLORIDE.
Inventors
- 👤 Paul R Schwan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/181; B; B21; B21B; B21B3/00; B21B3/003; B21B45/00; B21B45/04; B21B45/08; B21B1/00; B21B1/16; B21B1/18; B21B2003/005; B21B45/02; B21B45/0203; B21B45/0209; B21B45/0215; B21B45/0224; B21B45/0239; B21B45/0245; B21B45/0248; B21B45/0257
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |