US2947674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing porous chromium wearing surfaces
Assignee: Metal Finishers Inc
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Filing: 1957-12-19
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Granted: 1960-08-02
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Expires: 1977-12-19
Abstract
No abstract record available.
Inventors
- 👤 John A Andrisek
- 👤 Thomas R Gill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/48; C25D3/00; C25D3/02; C25D3/04; C25D3/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12458; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12861
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
153 words
A METHOD OF PRODUCING A POROUS LAYER OF ELECTROLYTICALLY DEPOSITED CHROMIUM, WHICH COMPRISES THE STEPS OF PLACING A WEARING MEMBER HAVING A RELATIVELY NONPOROUS LAYER OF ELECTROLYTICALLY DEPOSITED CHROMIUM IN A BATH CONSISTING ESSENTIALLY OF WATER, AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM HYDROXIDES AND SALTS THEREOF, CHROMIC ACID, AND PHOSPHORIC, SULFURIC AND HYDROCHLORIC ACIDS PASSING AN ALTERNATING CURRENT BETWEEN SAID LAYER AND ANOTHER ELECTRODE SUBSTANTIALLY EQUALLY SPACED THEREFROM AT A DENSITY OF 5 TO 120 AMPERES PER SQUARE DECIMETER FOR A SUFFICIENT TIME TO PASS 50 TO 500 AMPERE MINUTES OF ELECTRICITY FROM EACH SQUARE DECIMETER OF THE SURFACE OF SAID CHROMIUM LAYER TO PROVIDE PORES IN SAID SURFACE, AND THEREAFTER HONING SAID SURFACE, WHEREBY A WEARING SURFACE HAVING POROSITY FOR RETAINING LUBRICATING OIL WHILE HAVING EXCELLENT HARDNESS AND WEAR RESISTANCE IS OBTAINED, THE TOTAL CONCENTRATION OF MATERIAL IN SAID BATH BEING AT LEAST .05 NORMAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |