US3591432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for surface treatment of lead and its alloys
Assignee: AT&T Inc
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Filing: 1968-05-08
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Granted: 1971-07-06
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Expires: 1988-05-08
Abstract
Abstract THIS IS A METHOD FOR THE SURFACE TREATMENT OF LEAD AND ITS ALLOYS WHICH RESULTS IN AN IMPROVED JOINT SUBSEQUENTLY FORMED BETWEEN THE METAL AND ORGANIC MATERIALS AND COMPRISES TREATMENT IN AN AQUEOUS SOLUTION CONTAINING DICHROMATE IONS AND HYDROFLUORIC, FLUOBORIC, OR ACETIC ACID. DESCRIBED EMBODIMENTS OF THE SURFACE TREATMENT INCLUDE USE OF THE SOLUTION BOTH ASS A LIQUID AS A GEL.
Inventors
- 👤 Hargovind N Vazirani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:56
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |