US2539246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making aluminum clad steel
Assignee: Duracell Inc USA
•
Filing: 1944-10-07
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Granted: 1951-01-23
•
Expires: 1964-10-07
Abstract
No abstract record available.
Inventors
- 👤 Franz R Hensel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:19
CPC Classifications
B; B23; B23K; B23K13/00; B23K13/06; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/912; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/936; Y10S428/938; Y10S428/939; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12771; Y10T428/12861; Y10T428/12896; Y10T428/12903; Y10T428/12917; Y10T428/12924; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE CONTINUOUS METHOD OF MAKING ALUMINUM-STEEL OVERLAY METAL FROM LAYERS OF ALUMINUM AND STEEL WHICH COMPRISES CLEANING THE BONDING SURFACES OF THE ALUMIUM AND STEEL LAYERS, COATING THE CLEANED SURFACES OF BOTH SAID LAYERS WITH LAYERS OF SILVER HAVING THICKNESSES NOT OVER .003", PLACING SAID LAYERS OF ALUMINUM AND STEEL TOGETHER WITH THE SILVER COATINGS IN CONTACT, PREHEATING THE LAYERS IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE BELOW THE MELTING POINT OF SILVER AND BETWEEN ABOUT 350* AND ABOUT 500* C., AND HOT ROLLING SAID PREHEATED LAYERS TO REDUCE THE THICKNESS OF THE LAYERS AND TO PERMANENTLY BOND THE LAYERS TOGETHER.
Claim 2
Dependent Claim
101 words
THE CONTINUOUS METHOD OF MAKING ALUMINUM-STEEL OVERLAY METAL FROM LAYERS OF ALUMINUM AND STEEL WHICH COMPRISES CLEANING THE BONDING SURFACES OF THE ALUMIUM AND STEEL LAYERS, COATING THE CLEANED SURFACES OF BOTH SAID LAYERS WITH LAYERS OF SILVER HAVING THICKNESSES NOT OVER .003", PLACING SAID LAYERS OF ALUMINUM AND STEEL TOGETHER WITH THE SILVER COATINGS IN CONTACT, PREHEATING THE LAYERS IN A NON-OXIDIZING ATMOSPHERE TO A TEMPERATURE BELOW THE MELTING POINT OF SILVER AND BETWEEN ABOUT 350* AND ABOUT 500* C., AND HOT ROLLING SAID PREHEATED LAYERS TO REDUCE THE THICKNESS OF THE LAYERS AND TO PERMANENTLY BOND THE LAYERS TOGETHER.
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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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |