US3755018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing receptive surface for synthetic resin coating compositions
Assignee: Eltzroth & Ass J M
•
Filing: 1971-04-26
•
Granted: 1973-08-28
•
Expires: 1991-04-26
Abstract
Abstract Compositions and a process are provided for inhibiting corrosion of non-ferrous metal surfaces and for producing a surface to which synthetic resin coating compositions will adhere so that the resultant coatings have satisfactory impact and bending resistance, together with resistance to creeping corrosion between the metal and the dried resin coating.
Inventors
- 👤 R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:22
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/51; C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
54 words
A chromate depositing composition consisting essentially of an aqueous solution of the following: Ingredients Grams per Liter Dichromates 1.66-6.75 Chromic acid 0.33-2.88 Sodium or ammonium fluoride or bifluoride 0.33-1.36 Boric acid 0.33-2.00 Sodium acid sulfate 0.10-0.90 Aluminum sulfate 0-0.70 Magnesium sulfate 0-0.70 Fluoboric acid (50%) 0.66-2.75 Nickel sulfate (NiSO4) trace Iron sulfate (FeSO4) trace
Claim 2
Dependent Claim
26 words
A composition as claimed in claim 2 containing a sufficient amount of a reducing agent to convert a part of the hexavalent chromium to trivalent chromium.
Claim 3
Dependent Claim
30 words
A composition as claimed in claim 3 in which the reducing agent consists essentially of sodium sulfite and sodium nitrite each in proportions of 0.05 to 0.2 gram per liter.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |