Patent US2728696A successfully refreshed from Google Patents.
US2728696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of oxide coatings on ferrous surfaces and mechanically working the same
Assignee: Individual
•
Filing: 1951-11-05
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Granted: 1955-12-27
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Expires: 1971-11-05
Abstract
No abstract record available.
Inventors
- 👤 Singer Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:43
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE PROCESS FOR PRODUCING A UNIFORM, SMOOTH, BRIGHT AND STRONGLY ADHERENT COATING CONSISTING MAINLY OF HYDRATED FERRIC OXIDE ON THE SURFACE OF IRON AND STEEL ARTICLES, AND OTHER ARTICLES HAVING A FERROUS SURFACE, WHICH COMPRISES PROVIDING SAID SURFACE WITH A FILM OF AN AQUEOUS SOLUTION OF A CHEMICAL OF THE CLASS CONSISTING OF ACIDS AND ACID-REACTING SALTS, SAID SOLUTION HAVING A FREE ACID CONTENT EQUIVALENT TO ABOUT 0.2% TO 3% HYDROCHLORIC ACID, DRYING SAID FILM ON SAID SURFACE, AND SUBJECTING THE FILMED SURFACE IN DRY FORM TO THE ACTION OF AIR HAVING A RELATIVE HUMIDITY SUCH AS TO CAUSE THE REACTION TO GO TO THE FERRIC OXIDE STAGE, UNTIL THE SURFACE IS UNIFORMLY COVERED WITH A RED-BROWN COATING CONSISTING MAINLY OF HYDRATED FERRIC OXIDE WHICH IS FIRMLY BONDED TO SAID SURFACE.
Claim 2
Dependent Claim
131 words
THE PROCESS FOR PRODUCING A UNIFORM, SMOOTH, BRIGHT AND STRONGLY ADHERENT COATING CONSISTING MAINLY OF HYDRATED FERRIC OXIDE ON THE SURFACE OF IRON AND STEEL ARTICLES, AND OTHER ARTICLES HAVING A FERROUS SURFACE, WHICH COMPRISES PROVIDING SAID SURFACE WITH A FILM OF AN AQUEOUS SOLUTION OF A CHEMICAL OF THE CLASS CONSISTING OF ACIDS AND ACID-REACTING SALTS, SAID SOLUTION HAVING A FREE ACID CONTENT EQUIVALENT TO ABOUT 0.2% TO 3% HYDROCHLORIC ACID, DRYING SAID FILM ON SAID SURFACE, AND SUBJECTING THE FILMED SURFACE IN DRY FORM TO THE ACTION OF AIR HAVING A RELATIVE HUMIDITY SUCH AS TO CAUSE THE REACTION TO GO TO THE FERRIC OXIDE STAGE, UNTIL THE SURFACE IS UNIFORMLY COVERED WITH A RED-BROWN COATING CONSISTING MAINLY OF HYDRATED FERRIC OXIDE WHICH IS FIRMLY BONDED TO SAID SURFACE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |