US4622948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cookware having integrally formed natural stone bottoms and method of manufacturing the same
Assignee: J&L INTERNATIONAL CORP
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Filing: 1985-03-04
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Granted: 1986-11-18
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Expires: 2005-03-04
Abstract
Abstract Improved cookware is disclosed having non-ferrous metal sidewalls and a natural stone bottom central portion. The non-ferrous metal sidewalls preferably are formed of an aluminum alloy having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of the natural stone bottom. The natural stone bottom preferably comprises an iron-rich amphibole rock, and in the particularly preferred embodiment comprises hornblende.
Inventors
- 👤 Chang H. Oh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:31
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/004; A47J36/00; A47J36/02; Y; Y10; Y10S; Y10S220/00; Y10S220/912
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
63 words
A cooking utensil comprising: a metal sidewall; and a bottom portion formed of natural stone, said bottom portion mating with and joined to said sidewall to form a liquid-tight, partially enclosed receptacle capable of containing liquids therein, said natural stone bottom portion of said receptacle having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of said metal sidewall.
Claim 2
Dependent Claim
63 words
A cooking utensil comprising: a metal sidewall; and a bottom portion formed of natural stone, said bottom portion mating with and joined to said sidewall to form a liquid-tight, partially enclosed receptacle capable of containing liquids therein, said natural stone bottom portion of said receptacle having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of said metal sidewall.
Claim 3
Dependent Claim
25 words
The cooking utensil of claim 1 wherein: said metal comprises an alloy of aluminum and wherein said natural stone comprises an iron rich amphibole rock.
Claim 4
Dependent Claim
15 words
The cooking utensil of claim 2 wherein: said iron rich amphibole rock comprises hornblende rock.
Claim 5
Dependent Claim
21 words
The cooking utensil of claim 3 wherein: said aluminum alloy comprises a solid solution of aluminum, silicon, copper, magnesium and zinc.
Claim 6
Dependent Claim
48 words
The cooking utensil of claim 3 wherein: said bottom portion includes an outer peripheral lip about the perimeter thereof; and wherein said sidewall includes an inner peripheral lip mating with said outer peripheral lip whereby a strong mechanical juncture is formed between the sidewall and said bottom portion.
Claim 7
Dependent Claim
20 words
The cooking utensil of claim 5 wherein said metal sidewall is substantially cylindrical and wherein said bottom portion is circular.
Claim 8
Dependent Claim
22 words
The cooking utensil of claim 1 wherein said metal comprises an alloy of aluminum and wherein said natural stone comprises serpentine rock.
Claim 9
Dependent Claim
116 words
A cooking utensil comprising: a substantially cylindrical sidewall formed of an alloy of aluminum, said sidewall having a radially inwardly extending peripheral lip at the bottom thereof, said lip having an upper surface; and a circular bottom portion formed of natural stone, said natural stone having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of said aluminum alloy, said circular bottom portion having a radially outwardly extending peripheral lip having a lower surface, said upper and said lower surfaces, mating with each other so as to form a strong mechanical and liquid-tight juncture between the bottom portion and said sidewall, and said bottom portion with said sidewall forming a liquid-containing vessel.
Claim 10
Dependent Claim
116 words
A cooking utensil comprising: a substantially cylindrical sidewall formed of an alloy of aluminum, said sidewall having a radially inwardly extending peripheral lip at the bottom thereof, said lip having an upper surface; and a circular bottom portion formed of natural stone, said natural stone having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of said aluminum alloy, said circular bottom portion having a radially outwardly extending peripheral lip having a lower surface, said upper and said lower surfaces, mating with each other so as to form a strong mechanical and liquid-tight juncture between the bottom portion and said sidewall, and said bottom portion with said sidewall forming a liquid-containing vessel.
Claim 11
Dependent Claim
21 words
The cooking utensil of claim 8 wherein said aluminum alloy comprises a solid solution of aluminum, silicon, copper, magnesium and zinc.
Claim 12
Dependent Claim
13 words
The cooking utensil of claim 8 wherein said natural stone comprises hornblende rock.
Claim 13
Dependent Claim
63 words
A cooking utensil comprising: a metal body portion; and a central body portion of natural stone, said metal body portion substantially surrounding and being joined to said central body portion in a liquid-tight manner for containing liquid therein, said natural stone central body portion having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of said metal base portion.
Claim 14
Dependent Claim
63 words
A cooking utensil comprising: a metal body portion; and a central body portion of natural stone, said metal body portion substantially surrounding and being joined to said central body portion in a liquid-tight manner for containing liquid therein, said natural stone central body portion having a coefficient of thermal expansion substantially equal to the coefficient of thermal expansion of said metal base portion.
Claim 15
Dependent Claim
22 words
The cooking utensil of claim 11 wherein: said metal comprises an alloy of aluminum, and wherein said natural stone comprises hornblende rock.
Claim 16
Dependent Claim
21 words
The cooking utensil of claim 12 wherein: said aluminum alloy comprises a solid solution of aluminum, silicon, copper, magnesium and zinc.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |