US3607453A
Expired / Lapsed
US
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Metal treating process
Assignee: HOOKE CHEMICAL CORP
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Filing: 1969-10-02
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Granted: 1971-09-21
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Expires: 1989-10-02
Abstract
Abstract A process for phosphating iron and steel by treating it with a peroxide accelerated zinc phosphate solution. The phosphating solution used contains zinc, P2O5, H2O2, B2O3 and NO3. The desired amounts and ratios of these components are maintained in the solution by the controlled addition of zinc, P2O5, NO3(as HNO3)and sodium perborate.
Inventors
- 👤 Rolf Engesser
- 👤 Richard Tuch
- 👤 Winfried Menzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:59
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/12; C23C22/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
The method as claimed in claim 1 wherein the components of the treating solution are maintained in the desired range by replenishing the solution by the addition of zinc, P2O5, X and sodium perborate, in a weight ratio of zinc:P2O5:sodium perborate, calculated as NaBO2.H2O2.3H2O, of 0.4-0.6:1:0.4-2.5 and by the addition of X anions as HX in an amount such that the weight ratio of free P2O5 to total P2O5 in the total replenishing materials, exclusive of the sodium perborate, is within the range of about 0.35 to 0.65.
Claim 2
Dependent Claim
28 words
The method as claimed in claim 2 wherein the amount of B2O3 in the treating solution is within the range of about 1 to 10 grams per liter.
Claim 3
Dependent Claim
30 words
The method as claimed in claim 3 wherein the weight ratio of free P2O5 to total P2O5 in the treating solution is within the range of about 0.12 to 0.16.
Claim 4
Dependent Claim
13 words
The method as claimed in claim 4 wherein the X anions are NO3.
Claim 5
Dependent Claim
16 words
The method as claimed in claim 5 wherein the metal surfaces treated are ferrous metal surfaces.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |