Patent US6233172B1 successfully refreshed from Google Patents.
US3100581A
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US
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Duplex aluminous metal article
Assignee: Alcoa Corp
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Filing: 1959-04-21
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Granted: 1963-08-13
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Expires: 1979-04-21
Abstract
No abstract record available.
Inventors
- 👤 David G Vandenburgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:59
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/016; F; F24; F24D; F24D19/00; F24D19/0092; F24H; F24H1/00; F24H1/18; F24H1/181; F24H1/183; F24H9/00; F24H9/40; F24H9/45; F24H9/455; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
AN ALUMINOUS METAL HOT WATER TANK, THE WALLS OF WHICH ARE COMPOSED OF A DUPLEX METAL PRODUCT COMPRISING A BASE PORTION COMPOSED OF AN ALLOY CONSISTING ESSENTIALLY OF ALUMINUM, 2 TO 4% MAGNESIUM AND 0.5 TO 1% MANGANESE, AND A COATING BONDED TO SAID BASE PORTION ON THE SIDE FORMING THE INNER SURFACE OF THE TANK WALL, SAID COATINGG PROVIDING ELECTROLYTIC PROTECTION TO THE SAID BASE PORTION IN THE PRESENCE OF HOT WATER ANDD CONSISTING OF AN ALLOY OF ALUMINUM, 1 TO 4% MAGNESIUM, 0.5 TO 2% ZINC AND CONTAINING NOT MORE THAN 0.15% OF ALL IMPURITIES,
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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) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |