US2623847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Black chromium plating
Assignee: Individual
•
Filing: 1947-09-10
•
Granted: 1952-12-30
•
Expires: 1967-09-10
Abstract
No abstract record available.
Inventors
- 👤 Lloyd O Gilbert
- 👤 Charles C Buhman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:58
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF PRODUCING A DARK-GREY TO BLACK, CORROSION RESISTANT, ADHERENT FILM UPON A CONDUCTIVE BASE WHICH COMPRISES MAKING THE BASE THE CATHODE OF AN ELECTROPLATING CELL IN WHICH THE ELECTROLYTE COMPRISES AN AQUEOUS SOLUTION OF 275 G. OF CHROMIC ANHYDRIDE AND 200 ML. OF GLACIAL ACETIC ACID PER LITER OF SOLUTION AND ELECTROLYSING AT A CATHODE CURRENT DENSITY OF FROM 15 TO 1000 AMPERES PER SQUARE FOOT.
Claim 2
Dependent Claim
68 words
THE PROCESS OF PRODUCING A DARK-GREY TO BLACK, CORROSION RESISTANT, ADHERENT FILM UPON A CONDUCTIVE BASE WHICH COMPRISES MAKING THE BASE THE CATHODE OF AN ELECTROPLATING CELL IN WHICH THE ELECTROLYTE COMPRISES AN AQUEOUS SOLUTION OF 275 G. OF CHROMIC ANHYDRIDE AND 200 ML. OF GLACIAL ACETIC ACID PER LITER OF SOLUTION AND ELECTROLYSING AT A CATHODE CURRENT DENSITY OF FROM 15 TO 1000 AMPERES PER SQUARE FOOT.
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) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |