US3778299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary barrel diffusion coating in molten lead
Assignee: Surfalloy Corp
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Filing: 1971-11-12
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Granted: 1973-12-11
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Expires: 1991-11-12
Abstract
Abstract A NOVEL PROCESS FOR DIFFUSION COATING OF FERROUS ARTICLES IN A LEAD BATH BY SEALING ALL OF THE CONSTITUENTS IN A BARREL WHICH IS ROTATED IN A NON-VERTICAL POSITION AT THE CHROMIZING TEMPERATURE. SUCH PROCESSING RESULTS IN EXTREMELY DIFFUSED ZONES ON IRREGULARLY-SHAPED PARTS.
Inventors
- 👤 J Rausch
- 👤 Thyne R Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:56
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; C23C10/22
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |