US2813804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead coating process
Assignee: Steel Ceilings Inc
•
Filing: 1952-06-13
•
Granted: 1957-11-19
•
Expires: 1972-06-13
Abstract
No abstract record available.
Inventors
- 👤 Fred E Kendall
- 👤 Golar Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:58
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12701
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE METHOD OF FORMING A PROTECTIVE SUBSTANTIAL, SOUND, ADHERENT LEAD COATING ON FERROUS ARTICLES WHICH COMPRISES SUBJECTING SUCH ARTICLE TO THE ACTION OF A WATERR SOLUTION OF A LEAD SALT OF AN ALIPHATIC MONO-BASIC HYDROXYY ACID HAVING A PH BELOW 7 AND A LEAD ION CONCENTRATION OF FROM ABOUT 50 TO 250 GRAMS PER LITER AT A TEMPERATURE OF FROM 155* TO 200*F. FOR A PERIOD OF TIME SUFFICIENT TO DEPOSIT A LEAD COATING OF AT LEAST 0.0003 INCH THICK-NESS ON SUCH ARTICLE BY CHEMICAL DISPLACEMENT.
Claim 2
Independent Claim
86 words
THE METHOD OF FORMING A PROTECTIVE SUBSTANTIAL, SOUND, ADHERENT LEAD COATING ON FERROUS ARTICLES WHICH COMPRISES SUBJECTING SUCH ARTICLE TO THE ACTION OF A WATERR SOLUTION OF A LEAD SALT OF AN ALIPHATIC MONO-BASIC HYDROXYY ACID HAVING A PH BELOW 7 AND A LEAD ION CONCENTRATION OF FROM ABOUT 50 TO 250 GRAMS PER LITER AT A TEMPERATURE OF FROM 155* TO 200*F. FOR A PERIOD OF TIME SUFFICIENT TO DEPOSIT A LEAD COATING OF AT LEAST 0.0003 INCH THICK-NESS ON SUCH ARTICLE BY CHEMICAL DISPLACEMENT.
References Cited (Backward Citations)
US433074A
Cited
US570554A
Cited
US2236296A
Cited
GB130302A
Cited
US1371445A
Cited
US2111199A
Cited
US2230602A
Cited
US2410844A
Cited
US2545566A
Cited
US2560979A
Cited
US2658842A
Cited
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 |