US3278331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating steel with zinc
Assignee: Pennwalt Corp
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Filing: 1965-07-26
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Granted: 1966-10-11
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Expires: 1985-07-26
Abstract
No abstract record available.
Inventors
- 👤 Kendrick C Taylor
- 👤 David E Stokes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:55
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/02; C23C14/024; C23C14/025; C23C14/06; C23C14/14; C23C14/16; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
FIG-01
Claim 2
Dependent Claim
1 words
FIG-01
Claim 3
Dependent Claim
149 words
A PROCESS FOR COATING A STRIP OF STEEL WITH A LAYER OF ZINC COMPRISING THE STEPS OF FEEDING SAID STRIP THROUGH A CHAMBER, EVACUATING SAID CHAMBER, HEATING SAID STRIP TO A TEMPERATURE BETWEEN ABOUT AMIBIENT TEMPERATURE AND THE VAPORIZATION TEMPERATURE OF ZINC AT THE PRESSURE IN SAID CHAMBER BUT BELOW THE ALLOYING TEMPERATURE OF ZINC AND STEEL, EXPOSING SAID STRIP TO ZINC VAPORS WHILE THE STRIP IS IN SAID CHAMBER AND AT SAID TEMPERATURE TO CONDENSE A FILM OF ZINC BETWEEN 1 AND 100 MICROINCHES THICK ON SAID STRIP WHILE MAINTAINING THE VACUUM IN SAID CHAMBER. THEN HEATING THE STRIP AND FILM TO ANY ALLOYING TEMPERATURE OF APPROXIAMATELY 460*C. TO FORM AN ALLOY OF SAID ZINC FILM AND STRIP, THEN COOLING THE THUSLY-COATED STRIP, THEN COATING THE ALLOY FILM WITH A THIN LAYER OF ZINC WHILE THE ALLOY FILM IS AT A TEMPERATURE BELOW THE VAPORATION TEMPERATURE OF ZINC.
Claim 4
Dependent Claim
149 words
A PROCESS FOR COATING A STRIP OF STEEL WITH A LAYER OF ZINC COMPRISING THE STEPS OF FEEDING SAID STRIP THROUGH A CHAMBER, EVACUATING SAID CHAMBER, HEATING SAID STRIP TO A TEMPERATURE BETWEEN ABOUT AMIBIENT TEMPERATURE AND THE VAPORIZATION TEMPERATURE OF ZINC AT THE PRESSURE IN SAID CHAMBER BUT BELOW THE ALLOYING TEMPERATURE OF ZINC AND STEEL, EXPOSING SAID STRIP TO ZINC VAPORS WHILE THE STRIP IS IN SAID CHAMBER AND AT SAID TEMPERATURE TO CONDENSE A FILM OF ZINC BETWEEN 1 AND 100 MICROINCHES THICK ON SAID STRIP WHILE MAINTAINING THE VACUUM IN SAID CHAMBER. THEN HEATING THE STRIP AND FILM TO ANY ALLOYING TEMPERATURE OF APPROXIAMATELY 460*C. TO FORM AN ALLOY OF SAID ZINC FILM AND STRIP, THEN COOLING THE THUSLY-COATED STRIP, THEN COATING THE ALLOY FILM WITH A THIN LAYER OF ZINC WHILE THE ALLOY FILM IS AT A TEMPERATURE BELOW THE VAPORATION TEMPERATURE OF ZINC.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |