Patent US2800437A successfully refreshed from Google Patents.
US2800437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:25
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/48; C25D5/50; 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
189 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 IN AN AQUEOUS CHROMIUM PLATING BATH AT A TEMPERATURE OF 120 TO 170* F., SAID BATH COMPRISING ESSENTIALLY 400 TO 800 G./1. OF CRO3, A SULFATE-CONTAINING COMPOUND AND A SILICOFLUORIDE-CONTAINING COMPOUND EACH IN AN AMOUNT TO PROVIDE, AS CATALYSTS, 0.5 TO 6.0 G./1. OF DISSOLVED SULFATE, SO4=, AND 0.1 TO 16.0 G./1. OF DISSOLVED SILICOFLUORIDE, SIF6=, RESPECTIVELY, THE SUM OF DISSOLVED SULFATE AND DISSOLVED SILICOFLUORIDE VARYING WITH THE CRO3 CONCENTRATION AS FOLLOWS: AS THE CRO3 INCREASES FROM 400 TO 800 G./1., THE LOWER LIMIT OF THE SAID SUM INCREASES LINERALY FROM 2.7 TO 4.4 G./1. AND THE UPPER LIMIT OF THE SAID SUM INCREASES LINEARLY FROM 9.0 TO 17.0 G/1.,PLATING CHROMIUM ON THE ARTICLE TO FORM A COATING AT LEAST 2 MILS THICK, HEATING THE PLATED ARTICLE TO A TEMPERATURE OF 200 TO 800* F. FOR A SUFFICIENT DURATION TO PRODUCE A CHROMIUM PLATED ARTICLE OF SAID HARD STEEL HAVING A FATIGUE STRENGTH OF AT LEAST 60% OF THAT OF THE ORIGINAL UNPLATED STEEL.
Claim 2
Independent Claim
189 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 IN AN AQUEOUS CHROMIUM PLATING BATH AT A TEMPERATURE OF 120 TO 170* F., SAID BATH COMPRISING ESSENTIALLY 400 TO 800 G./1. OF CRO3, A SULFATE-CONTAINING COMPOUND AND A SILICOFLUORIDE-CONTAINING COMPOUND EACH IN AN AMOUNT TO PROVIDE, AS CATALYSTS, 0.5 TO 6.0 G./1. OF DISSOLVED SULFATE, SO4=, AND 0.1 TO 16.0 G./1. OF DISSOLVED SILICOFLUORIDE, SIF6=, RESPECTIVELY, THE SUM OF DISSOLVED SULFATE AND DISSOLVED SILICOFLUORIDE VARYING WITH THE CRO3 CONCENTRATION AS FOLLOWS: AS THE CRO3 INCREASES FROM 400 TO 800 G./1., THE LOWER LIMIT OF THE SAID SUM INCREASES LINERALY FROM 2.7 TO 4.4 G./1. AND THE UPPER LIMIT OF THE SAID SUM INCREASES LINEARLY FROM 9.0 TO 17.0 G/1.,PLATING CHROMIUM ON THE ARTICLE TO FORM A COATING AT LEAST 2 MILS THICK, HEATING THE PLATED ARTICLE TO A TEMPERATURE OF 200 TO 800* F. FOR A SUFFICIENT DURATION TO PRODUCE A CHROMIUM PLATED ARTICLE OF SAID 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 |