US3578439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amalgamation process
Assignee: MAXIMILLIAN R MERRIMAN
•
Filing: 1968-07-02
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Granted: 1971-05-11
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Expires: 1988-07-02
Abstract
Abstract METHODS FOR AMALGAMATING IRON, PLATINUM, AND FERROUS ALLOYS, BY ACID CLEANING THE MATERIAL TO BE AMALGAMATED AND PERMITTING MOISTURE TO REMAIN OR FORM ON THE CLEANED METAL PRIOR TO DIPPING IN AMALGAM.
Inventors
- 👤 Maximillian R Merriman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:22
CPC Classifications
C; C22; C22C; C22C1/00; C22C7/00
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |