US2800443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of chromium plating
Assignee: Primerica Inc
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Filing: 1955-07-26
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Granted: 1957-07-23
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Expires: 1975-07-26
Abstract
No abstract record available.
Inventors
- 👤 Jesse E Stareck
- 👤 Jr Edgar J Seyb
- 👤 Passal Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:50
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD OF REDUCING THE LOSS OF FATIGUE STRENGTH FOLLOWING CHROMIUM PLATING OF AN ARTICLE OF HARD STEEL COMPRISING ELECTRODEPOSITING CHROMIUM ON THE ARTICLE BY PASSING A CURRENT OF 1/4 TO 5 A.S.I.TO SAID ARTICLE AS CATHODE IN AN AQUEOUS CHROMIUM PLATING BATH AT A TEMPERATURE OF 90 TO 110* F., SAID BATH HAVING A CRO3 CONTENT OF 100 TO 400 G./L. AND CONTAINING DISSOLVED SULFATE, SO4=, AS CATALYST, THE RATIO OF CRO3 TO DISSOLVED SULFATE BEING 100:1 TO 40:1 PLATING CHROMIUM ON THE ARTICLE TO FORM A DEPOSIT AT LEAST 1 MIL THICK, SAID DEPOSIT BEING CHARACTERIZED BY HAVING AT LEAST 1000 CRACK-LINES PER INCH AND A STRESS BELOW +5,000 P.S.I., AND THEREBY PRODUCING A CHROMIUM PLATED ARTICLE OF HARD STEEL HAVING A FATIGUE STRENGTH OF AT LEAST 60% OF THAT OF THE ORIGINAL UNPLATED STEEL.
Claim 2
Independent Claim
137 words
A METHOD OF REDUCING THE LOSS OF FATIGUE STRENGTH FOLLOWING CHROMIUM PLATING OF AN ARTICLE OF HARD STEEL COMPRISING ELECTRODEPOSITING CHROMIUM ON THE ARTICLE BY PASSING A CURRENT OF 1/4 TO 5 A.S.I.TO SAID ARTICLE AS CATHODE IN AN AQUEOUS CHROMIUM PLATING BATH AT A TEMPERATURE OF 90 TO 110* F., SAID BATH HAVING A CRO3 CONTENT OF 100 TO 400 G./L. AND CONTAINING DISSOLVED SULFATE, SO4=, AS CATALYST, THE RATIO OF CRO3 TO DISSOLVED SULFATE BEING 100:1 TO 40:1 PLATING CHROMIUM ON THE ARTICLE TO FORM A DEPOSIT AT LEAST 1 MIL THICK, SAID DEPOSIT BEING CHARACTERIZED BY HAVING AT LEAST 1000 CRACK-LINES PER INCH AND A STRESS BELOW +5,000 P.S.I., AND THEREBY PRODUCING A CHROMIUM PLATED ARTICLE OF HARD STEEL HAVING A FATIGUE STRENGTH OF AT LEAST 60% OF THAT OF THE ORIGINAL UNPLATED STEEL.
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) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |