US2552874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of phosphatizing ferriferous surfaces
Assignee: Henkel Corp
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Filing: 1950-05-01
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Granted: 1951-05-15
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Expires: 1970-05-01
Abstract
No abstract record available.
Inventors
- 👤 Snyder Eugene
- 👤 Ferdinand P Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:55
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN THE ART OF PHOSPHATIZING FERRIFEROUS SURFACES, THE METHOD WHICH INCLUDES TREATING THE SURFACE WITH TWO SUCCESSIVE BATHS EACH CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF BOTH PRIMARY AND SECONDARY PHOSPHATES FROM THE CLASS WHICH CONSISTS OF ALKALI METALS AND AMMONIUM, THE SECOND OF SAID BATHS BEING ADJUSTED TO A PH OF FROM 4.7 TO 6.2 AND THE FIRST TO A PH WHICH IS AT LEAST 0.2 UNIT LOWER THAN THE SECOND BUT NEVER BELOW A PH OF 4.
Claim 2
Dependent Claim
79 words
IN THE ART OF PHOSPHATIZING FERRIFEROUS SURFACES, THE METHOD WHICH INCLUDES TREATING THE SURFACE WITH TWO SUCCESSIVE BATHS EACH CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF BOTH PRIMARY AND SECONDARY PHOSPHATES FROM THE CLASS WHICH CONSISTS OF ALKALI METALS AND AMMONIUM, THE SECOND OF SAID BATHS BEING ADJUSTED TO A PH OF FROM 4.7 TO 6.2 AND THE FIRST TO A PH WHICH IS AT LEAST 0.2 UNIT LOWER THAN THE SECOND BUT NEVER BELOW A PH OF 4.
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |