US3178320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for the formation of smooth zinc phosphate coatings on steel
Assignee: Individual
•
Filing: 1960-07-29
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Granted: 1965-04-13
•
Expires: 1980-07-29
Abstract
No abstract record available.
Inventors
- 👤 John A Henricks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:25
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A SMOOTH COATING ZINC DI-HYDROGEN PHOSPHATE IMMERSION COATING BATGH MADE UP FROM 1% TO 5% BY VOLUME OF A ZINC PHOSPHATE COATIN CONCENTRATE THAT IS SUBSTANTIALLY FREE OF SULFATE ION AND THAT HAS AN ACID RATIO ABOVE 1 FREE ACID TO 5 TOTAL ACID TO PROVIDE A BATH STRENGTH OF 10 TO 50 POINTS, AND CONSISTING ESSENTIALLY OF FROM ABOUT 2 TO 10 GRAMS PER LITER OF ZINC, FROM ABOUT 7 TO 35 GRAMS PER LITER OF PHOSPHATE AND A HIGHLY SOLUBLE NONOXIDIZING SALT OF CALCIUM THAT IS ABOUT ONE QUARTER MOLAR TO THE ZINC, SAID BATH BEING ACCELERATED BY AN ALKALI METAL NITRATE EQUAL NUMERICALLY IN GRAMS PER LITER TO AT LEAST ONE HALF OF THE TOTAL BATH POINTS.
Claim 2
Dependent Claim
120 words
A SMOOTH COATING ZINC DI-HYDROGEN PHOSPHATE IMMERSION COATING BATGH MADE UP FROM 1% TO 5% BY VOLUME OF A ZINC PHOSPHATE COATIN CONCENTRATE THAT IS SUBSTANTIALLY FREE OF SULFATE ION AND THAT HAS AN ACID RATIO ABOVE 1 FREE ACID TO 5 TOTAL ACID TO PROVIDE A BATH STRENGTH OF 10 TO 50 POINTS, AND CONSISTING ESSENTIALLY OF FROM ABOUT 2 TO 10 GRAMS PER LITER OF ZINC, FROM ABOUT 7 TO 35 GRAMS PER LITER OF PHOSPHATE AND A HIGHLY SOLUBLE NONOXIDIZING SALT OF CALCIUM THAT IS ABOUT ONE QUARTER MOLAR TO THE ZINC, SAID BATH BEING ACCELERATED BY AN ALKALI METAL NITRATE EQUAL NUMERICALLY IN GRAMS PER LITER TO AT LEAST ONE HALF OF THE TOTAL BATH POINTS.
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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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |