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Patent US2930723A successfully refreshed from Google Patents.
US2930723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of metals
Assignee: Walterisation Co Ltd
•
Filing: 1955-12-05
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Granted: 1960-03-29
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Expires: 1975-12-05
Abstract
No abstract record available.
Inventors
- 👤 Drysdale Royston Fraser
- 👤 Burton Stanley Arthur Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:23
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS WHICH COMPRISES FORMING A CRYSTALLINE ESSENTIALLY ZINC ORTHOPHOSPHATE COATING UPON THE SURFACE OF A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, ZINC, CADMIUM, AND ALLOYS OF SUCH METALS, BY TREATING THE SURFACE WITH AN AQUEOUS SOLUTION OF ZINC DIHYDROGEN ORTHOPHOSPHATE CONTAINING NITRATE IONS AND CONFORMING TO THE FOLLOWING FORMULATION:
Claim 2
Dependent Claim
52 words
A PROCESS WHICH COMPRISES FORMING A CRYSTALLINE ESSENTIALLY ZINC ORTHOPHOSPHATE COATING UPON THE SURFACE OF A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, ZINC, CADMIUM, AND ALLOYS OF SUCH METALS, BY TREATING THE SURFACE WITH AN AQUEOUS SOLUTION OF ZINC DIHYDROGEN ORTHOPHOSPHATE CONTAINING NITRATE IONS AND CONFORMING TO THE FOLLOWING FORMULATION:
References Cited (Backward Citations)
USRE24017E
Cited
GB633650A
Cited
US2528787A
Cited
GB684204A
Cited
GB726935A
Cited
US2758949A
Cited
US2743204A
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US2826517A
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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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |