US2817610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of black oxide coatings on steel and iron and composition therefor
Assignee: Individual
•
Filing: 1955-05-26
•
Granted: 1957-12-24
•
Expires: 1975-05-26
Abstract
No abstract record available.
Inventors
- 👤 Isaac L Newell
- 👤 Ernest A Walen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A COMPOSITION FOR THE BLACKENING OF FERROUS METALS CONSISTING ESSENTIALLY OF ALKALI METAL HYDROXIDE 50 TO 90 PARTS BY WEIGHT, ALKALI METAL NITRATE 0.1 TO 50 PARTS BY WEIGHT; ALKALI METAL NITRITE 3 TO 20 PARTS BY WEIGHT; TOGETHER WITH 0.1 TO 25 PARTS BY WEIGHT OF AT LEAST ONE COMPOUND CHOSEN FROM THE GROUP CONSISTING OF SOLUBLE ALKALI METAL THIOCYANATES; THIOUREA AND ALKYL THIOUREAS.
Claim 2
Dependent Claim
65 words
A COMPOSITION FOR THE BLACKENING OF FERROUS METALS CONSISTING ESSENTIALLY OF ALKALI METAL HYDROXIDE 50 TO 90 PARTS BY WEIGHT, ALKALI METAL NITRATE 0.1 TO 50 PARTS BY WEIGHT; ALKALI METAL NITRITE 3 TO 20 PARTS BY WEIGHT; TOGETHER WITH 0.1 TO 25 PARTS BY WEIGHT OF AT LEAST ONE COMPOUND CHOSEN FROM THE GROUP CONSISTING OF SOLUBLE ALKALI METAL THIOCYANATES; THIOUREA AND ALKYL THIOUREAS.
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) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |