US3767896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frying pan with a welded hollow-core expansion joint
Assignee: Individual
•
Filing: 1972-11-22
•
Granted: 1973-10-23
•
Expires: 1992-11-22
Abstract
Abstract A commercial type heating or cooking utensil having a hollowcore expansion joint in the weld seam between the dissimilar metals. The weld seam between the dissimilar metals has a tendency to crack or break due to the continued heating and cooling cycle of the utensil when in operation. A hollow-core expansion joint capable of being welded to each of the metals is laminated between the stainless steel and cast iron of the utensil and when bonded thereto, serves to absorb the stresses induced when the utensil is heated and cooled alternately. Hence, the novel of construction provides an improved stainless steelcast iron cooking utensil capable of withstanding the induced stresses of the heating and cooling cycles accompanying operation, without cracking or breaking at the weld seam.
Inventors
- 👤 J Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/004; A; A47; A47J; A47J27/00; A47J27/004; A47J27/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
In a welded stainless steel - cast iron cooking utensil, comprising a cast iron cooking surface sheet and a stainless steel jacket housing, having an integrally formed abutment lip projecting inwardly from the jacket housing exterior, and following the direction of the weld seam, the improvement consisting of a tubular, hollow-core, ferritic metal expansion joint member conforming to the respective circumferences of the jacket housing abutment lip and the edge of the cast iron cooking surface sheet, welded and sandwiched therebetween, thereby forming an integral unit structure of the jacket housing wall, expansion joint and cast iron cooking surface, said cooking utensil being equipped with an electric heating source.
Claim 2
Dependent Claim
109 words
In a welded stainless steel - cast iron cooking utensil, comprising a cast iron cooking surface sheet and a stainless steel jacket housing, having an integrally formed abutment lip projecting inwardly from the jacket housing exterior, and following the direction of the weld seam, the improvement consisting of a tubular, hollow-core, ferritic metal expansion joint member conforming to the respective circumferences of the jacket housing abutment lip and the edge of the cast iron cooking surface sheet, welded and sandwiched therebetween, thereby forming an integral unit structure of the jacket housing wall, expansion joint and cast iron cooking surface, said cooking utensil being equipped with an electric heating source.
Claim 3
Dependent Claim
25 words
The improvement as claimed in claim 1, wherein the exPansion joint is a ferritic metal having a carbon content of less than 3 per cent.
Claim 4
Dependent Claim
113 words
In a welded stainless steel-cast iron frying pan equipped with an electric heating source and a tiltable trunion stand, said frying pan comprised of a flat cast iron cooking surface sheet and a stainless steel jacket housing having an integrally formed abutment lip projecting inwardly from the jacket housing exterior and following the direction of the weld seam, the improvement consisting of a tubular, hollow-core, ferritic metal expansion joint member conforming to the respective circumferences of the jacket housing abutment lip and the edge of the cast iron cooking surface sheet, welded and sandwiched therebetween, thereby forming an integral unit structure of the jacket housing wall, expansion joint and cast iron cooking surface.
Claim 5
Dependent Claim
113 words
In a welded stainless steel-cast iron frying pan equipped with an electric heating source and a tiltable trunion stand, said frying pan comprised of a flat cast iron cooking surface sheet and a stainless steel jacket housing having an integrally formed abutment lip projecting inwardly from the jacket housing exterior and following the direction of the weld seam, the improvement consisting of a tubular, hollow-core, ferritic metal expansion joint member conforming to the respective circumferences of the jacket housing abutment lip and the edge of the cast iron cooking surface sheet, welded and sandwiched therebetween, thereby forming an integral unit structure of the jacket housing wall, expansion joint and cast iron cooking surface.
Claim 6
Dependent Claim
16 words
The improvement as claimed in claim 3, wherein the expansion joint is shaped wrought iron tubing.
Claim 7
Dependent Claim
16 words
The improvement as claimed in claim 3, wherein the expansion joint is shaped wrought iron sheet.
Claim 8
Dependent Claim
15 words
The improvement as claimed in claim 3, wherein the expansion joint is shaped steel tubing.
Claim 9
Dependent Claim
25 words
The improvement as claimed in claims 3, wherein the stainless steel jacket housing and the flat cast iron cooking surface sheet are of orbicular shape.
Claim 10
Dependent Claim
26 words
The improvement as claimed in claims 3, wherein the stainless steel jacket housing and the flat cast iron cooking surface sheet are substantially rectangular in shape.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |