Patent US3973921A successfully refreshed from Google Patents.
US3973921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-detachable tab stock
Assignee: Reynolds Metals Co
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Filing: 1975-04-01
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Granted: 1976-08-10
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Expires: 1995-04-01
Abstract
Abstract An aluminum-alloy tab stock, useful for non-detachable tabs having high yield strength and high bending endurance, and a process for manufacture thereof from a heat treatable core aluminum alloy and a non-heat treatable cladding aluminum alloy by arranging the alloys as layers of a composite, bonding the layers by hot-rolling the composite to a thickness reduction of 75-90%, cold-rolling the thinned composite to an additional thickness reduction of 60-70% to form the tab stock, solution heat treating the tab stock and rapidly cooling the tab stock. Optionally, aging to a selected temper may additionally be used.
Inventors
- 👤 Bennie R. Ward
- 👤 Donald R. Geisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:36
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K20/2336; B32; B32B; B32B15/00; B32B15/01; B32B15/016; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764; Y10T428/12986
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A doubly clad tab stock, adapted for an easy-open all-aluminum can, comprising a very strong core formed from a heat-treatable aluminum alloy and very soft and ductile claddings formed from a non-heat-treatable aluminum alloy arranged as a three-layer composit, said claddings being 10-35% of said tab stock per side, said tab stock having a high bending strength measured by a yield of at least 15 KSI, and a high flexing endurance measured by at least three flexes.
Claim 2
Dependent Claim
77 words
A doubly clad tab stock, adapted for an easy-open all-aluminum can, comprising a very strong core formed from a heat-treatable aluminum alloy and very soft and ductile claddings formed from a non-heat-treatable aluminum alloy arranged as a three-layer composit, said claddings being 10-35% of said tab stock per side, said tab stock having a high bending strength measured by a yield of at least 15 KSI, and a high flexing endurance measured by at least three flexes.
Claim 3
Dependent Claim
26 words
The doubly clad tab stock of claim 1 wherein said claddings are each 10% of said tab stock and said yield is at least 30 KSI.
Claim 4
Dependent Claim
26 words
The doubly clad tab stock of claim 1 wherein said claddings are each 20% of said tab stock and said yield is at least 25 KSI.
Claim 5
Dependent Claim
26 words
The doubly clad tab stock of claim 1 wherein said claddings are each 30% of said tab stock and said yield is at least 20 KSI.
Claim 6
Dependent Claim
24 words
The tab stock of claim 1 wherein said heat-treatable aluminum alloy is 2048 aluminum alloy and said non-heat-treatable aluminum alloy is 1235 aluminum alloy.
References Cited (Backward Citations)
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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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |