US2813805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead coating process
Assignee: Steel Ceilings Inc
•
Filing: 1952-06-13
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Granted: 1957-11-19
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Expires: 1972-06-13
Abstract
No abstract record available.
Inventors
- 👤 Fred E Kendall
- 👤 Henry A Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:54
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10S428/937; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12701
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE METHOD OF FORMING A LEAD COATING ON A FERROUS ARTICLE WHICH COMPRISES APPLYING THERETO A WATER SOLUTION OF A LEAD SALT OF AN ALIPHATIC POLY-BASIC HYDROXY ACID HAVING A PH OF FROM ABOUT4.5 TO ABOUT 6.5, A LEAD ION CON-CENTRATION OF FROM ABOUT 3 TO ABOUT 50 GRAMS PER LITER, AND AN OPERATING TEMPERATURE OF FROM ABOUT 130*F. TO BOILING FOR A TIME SUFFICIENT TO DEPOSIT AN APPRECIABLE LEAD COATING ON SUCH ARTICLE BY A CHEMICAL DISPLACEMENT REACTION.
Claim 2
Independent Claim
79 words
THE METHOD OF FORMING A LEAD COATING ON A FERROUS ARTICLE WHICH COMPRISES APPLYING THERETO A WATER SOLUTION OF A LEAD SALT OF AN ALIPHATIC POLY-BASIC HYDROXY ACID HAVING A PH OF FROM ABOUT4.5 TO ABOUT 6.5, A LEAD ION CON-CENTRATION OF FROM ABOUT 3 TO ABOUT 50 GRAMS PER LITER, AND AN OPERATING TEMPERATURE OF FROM ABOUT 130*F. TO BOILING FOR A TIME SUFFICIENT TO DEPOSIT AN APPRECIABLE LEAD COATING ON SUCH ARTICLE BY A CHEMICAL DISPLACEMENT REACTION.
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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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |