US3096220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion protection of aluminum
Assignee: Individual
•
Filing: 1960-10-31
•
Granted: 1963-07-02
•
Expires: 1980-10-31
Abstract
No abstract record available.
Inventors
- 👤 Robert S Dalrymple
- 👤 William B Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:05
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS OF PROTECTING AN ARTICLE HAVING A SURFACE OF ALUMINUM-BASE METAL AGAINST CORROSION, COMPRISING IMMERSING SAID ARTICLE IN AN AQUEOUS CHROMIC ACID SOLUTION OF A CONCENTRATION OF BETWEEN 0.5 AND 3% BY WEIGHT AND A PH VALUE OF BELOW 2, AND HEATING SAID SOLUTION AND SAID ARTICLE IN A HERMETICALLY SEALED SYSTEM AT FROM 160 TO 180*C. FOR FROM 20 TO 50 HOURS WHEREBY A CORROSIONRESISTANT, WELL-ADHERING FILM IS FORMED ON SAID SURFACE.
Claim 2
Dependent Claim
74 words
A PROCESS OF PROTECTING AN ARTICLE HAVING A SURFACE OF ALUMINUM-BASE METAL AGAINST CORROSION, COMPRISING IMMERSING SAID ARTICLE IN AN AQUEOUS CHROMIC ACID SOLUTION OF A CONCENTRATION OF BETWEEN 0.5 AND 3% BY WEIGHT AND A PH VALUE OF BELOW 2, AND HEATING SAID SOLUTION AND SAID ARTICLE IN A HERMETICALLY SEALED SYSTEM AT FROM 160 TO 180*C. FOR FROM 20 TO 50 HOURS WHEREBY A CORROSIONRESISTANT, WELL-ADHERING FILM IS FORMED ON SAID SURFACE.
References Cited (Backward Citations)
US2227469A
Cited
US2315564A
Cited
DE860306C
Cited
US2768104A
Cited
US2784122A
Cited
US2858244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-01 | 1966-12-31 | 1967-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-01 | 1970-12-31 | 1971-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-01 | 1974-12-31 | 1975-07-02 | $7700.00 | Window Closed / Lapsed |