US2839439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for producing phosphate coatings on metal
Assignee: Detrex Corp
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Filing: 1955-06-07
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Granted: 1958-06-17
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Expires: 1975-06-07
Abstract
No abstract record available.
Inventors
- 👤 Stapleton John Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:16
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/40; C23C22/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN A METHOD OF PRODUCING AN ADHERENT UNIFORM PHOSPHATE COATING ON A FERROUS METAL, THE STEPS WHICH COMPRISE SPRAYING SAID METAL WITH AN AQUEOUS SOLUTION OF ALKALI METAL DIHYDROGEN PHOSPHATE, AND ACCELERATING THE COATING ACTION BY INCORPORATING INTO THE SOLUTION AN ACCELERATOR CONSISTING OF ABOUT 0.4 TO 0.76% BY WEIGHT NITRATE AND ABOUT .0002 TO .0005% BY WEIGHT MOLYBDATE IONS.
Claim 2
Dependent Claim
60 words
IN A METHOD OF PRODUCING AN ADHERENT UNIFORM PHOSPHATE COATING ON A FERROUS METAL, THE STEPS WHICH COMPRISE SPRAYING SAID METAL WITH AN AQUEOUS SOLUTION OF ALKALI METAL DIHYDROGEN PHOSPHATE, AND ACCELERATING THE COATING ACTION BY INCORPORATING INTO THE SOLUTION AN ACCELERATOR CONSISTING OF ABOUT 0.4 TO 0.76% BY WEIGHT NITRATE AND ABOUT .0002 TO .0005% BY WEIGHT MOLYBDATE IONS.
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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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |