Patent US3855028A successfully refreshed from Google Patents.
US3855028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating structures
Assignee: Individual
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Filing: 1972-11-08
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Granted: 1974-12-17
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Expires: 1992-11-08
Abstract
Abstract A method of fabricating insulated and insulated/sound deadened structures such as duct-work, pipe and housings and the like from sheet and strip material. A coating of a foamable plastic is applied to at least one surface of a sheet or strip. The sheet or strip is cured by heating to solidify and bond the plastic but not expand it. The sheet or strip is then formed by conventional forming techniques. Subsequently, further heating causes expansion of the cured plastic.
Inventors
- 👤 D Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:07
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B29; B29C; B29C67/00; B29C67/20; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10605; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; B05D3/00; B05D3/02; B05D3/0209; B05D5/00; B32B2327/00; B32B2327/06; Y; Y10; Y10S; Y10S138/00; Y10S138/09; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A METHOD OF FABRICATING INSULATED STRUCTURES SUCH AS DUCT WORK, PIPER AND HOUSINGS AND THE LIKE FROM SHEET OR STRIP MATERIAL, COMPRISING THE STEPS OF: A. APPLYING A THIN FILM OF EXPANDABLE PLASTIC TO AT LEAST ONE SIDE OF A SHEER OR STRIP OF MATERIAL, B. SAID PLASTIC COMPRISING A FOAMABLE VINYL CHLORIDE POLYMER WHICH CAN BE AT LEAST PARTIALLY CURED WITHOUT NOTICEABLE EXPANSION WHEN HEATED TO A TEMPERATURE NOT EXCEEDING 350*F FOR 60 SECONDS OR LESS, C. HEATING THE STRIP OR SHEET OF MATERIAL IN A FIRST STAGE CURIN OPERATION FOR APPROXIMATELY 60 SECONDS TO AT LEAST PARTIALLY CURE THE PLASTIC AND CAUSE IT TO BE BONDED TO THE SHEET OR STRIP BUT INSUFFICIENT TO CAUSE NOTICEABLE EXPANSION OF THE PLASTIC, D. FORMING THE SHEET OR STRIP OF MATERIAL INTO A DESIRED STRUCTURE, AND E. HEATING THE STRUCTURE IN A SECOND STAGE CURING OPERATION FOR A PREDETERMINED PERIOD OF TIME SUFFICIENT TO CAUSE SAID PLASTIC FILM TO EXPAND AT LEAST SEVERAL TIMES IN THICKNESS.
Claim 2
Independent Claim
165 words
A METHOD OF FABRICATING INSULATED STRUCTURES SUCH AS DUCT WORK, PIPER AND HOUSINGS AND THE LIKE FROM SHEET OR STRIP MATERIAL, COMPRISING THE STEPS OF: A. APPLYING A THIN FILM OF EXPANDABLE PLASTIC TO AT LEAST ONE SIDE OF A SHEER OR STRIP OF MATERIAL, B. SAID PLASTIC COMPRISING A FOAMABLE VINYL CHLORIDE POLYMER WHICH CAN BE AT LEAST PARTIALLY CURED WITHOUT NOTICEABLE EXPANSION WHEN HEATED TO A TEMPERATURE NOT EXCEEDING 350*F FOR 60 SECONDS OR LESS, C. HEATING THE STRIP OR SHEET OF MATERIAL IN A FIRST STAGE CURIN OPERATION FOR APPROXIMATELY 60 SECONDS TO AT LEAST PARTIALLY CURE THE PLASTIC AND CAUSE IT TO BE BONDED TO THE SHEET OR STRIP BUT INSUFFICIENT TO CAUSE NOTICEABLE EXPANSION OF THE PLASTIC, D. FORMING THE SHEET OR STRIP OF MATERIAL INTO A DESIRED STRUCTURE, AND E. HEATING THE STRUCTURE IN A SECOND STAGE CURING OPERATION FOR A PREDETERMINED PERIOD OF TIME SUFFICIENT TO CAUSE SAID PLASTIC FILM TO EXPAND AT LEAST SEVERAL TIMES IN THICKNESS.
Claim 3
Dependent Claim
43 words
The method of claim 1 further characterized by and including the step of: a. in said second stage curing operation heating said structure to approximately 395*F., b. said predetermined period of time in said second stage curing operation being at least 3 minutes.
Claim 4
Dependent Claim
42 words
The method of claim 2 further characterized by and including the step of: a. extending said second stage curing operation for more than 3 minutes until sufficient outer surface cells on the insulation layer open to form a sound deadening, irregular surface.
Claim 5
Independent Claim
212 words
A method of fabricating insulated duct work from sheet or strip material, comprising the steps of: a. applying a thin film of plastic to at least one side of a substantially flat sheet or strip of metal, b. said plastic comprising a foamable vinyl chloride polymer which may be at least partially cured without noticeable expansion when heated to a temperature not exceeding 350* for 60 seconds or less, c. heating the strip or sheet of metal in a first stage curing operation for approximately 60 seconds to at least partially cure the plastic and cause it to be bonded to the metal but insufficient to cause noticeable expansion of the plastic, d. forming the sheet or strip of metal into duct work with said one side out and joining adjacent edges of the metal in lap joint means, and e. heating the fabricated duct work in a second stage curing operation for a predetermined period of time sufficient to cause said film to expand at least 40 times its original thickness except where it is restricted in said lap joint means whereby relatively thick insulation is formed over the entire outside of said duct work and an airtight seal is formed by expansion of said plastic in said lap joint means.
Claim 6
Independent Claim
212 words
A method of fabricating insulated duct work from sheet or strip material, comprising the steps of: a. applying a thin film of plastic to at least one side of a substantially flat sheet or strip of metal, b. said plastic comprising a foamable vinyl chloride polymer which may be at least partially cured without noticeable expansion when heated to a temperature not exceeding 350* for 60 seconds or less, c. heating the strip or sheet of metal in a first stage curing operation for approximately 60 seconds to at least partially cure the plastic and cause it to be bonded to the metal but insufficient to cause noticeable expansion of the plastic, d. forming the sheet or strip of metal into duct work with said one side out and joining adjacent edges of the metal in lap joint means, and e. heating the fabricated duct work in a second stage curing operation for a predetermined period of time sufficient to cause said film to expand at least 40 times its original thickness except where it is restricted in said lap joint means whereby relatively thick insulation is formed over the entire outside of said duct work and an airtight seal is formed by expansion of said plastic in said lap joint means.
Claim 7
Dependent Claim
51 words
The method of claim 4 further characterized by and including the step of: a. in said second stage curing operation heating said structure to approximately 395*F., b. said predetermined period of time in said second stage curing operation being at least 3 minutes for an expansion of at least 40 times.
Claim 8
Independent Claim
121 words
A method of fabricating a plastic coated metal structure, comprising the steps of: a. applying a thin film of expandable plastic to a surface of a strip or sheet of a metal member, b. heating the metal member in a first stage curing operation for a predetermined period of time sufficient to at least partially cure the plastic and cause it to be bonded to said sheet or strip but insufficient to cause noticeable expansion of the plastic, c. forming said sheet or strip of metal into a desired structure, and d. heating the structure in a second stage curing operation for a predetermined period of time sufficient to cause said plastic film to expand at least several times in thickness.
Claim 9
Independent Claim
121 words
A method of fabricating a plastic coated metal structure, comprising the steps of: a. applying a thin film of expandable plastic to a surface of a strip or sheet of a metal member, b. heating the metal member in a first stage curing operation for a predetermined period of time sufficient to at least partially cure the plastic and cause it to be bonded to said sheet or strip but insufficient to cause noticeable expansion of the plastic, c. forming said sheet or strip of metal into a desired structure, and d. heating the structure in a second stage curing operation for a predetermined period of time sufficient to cause said plastic film to expand at least several times in thickness.
Claim 10
Dependent Claim
52 words
The method of claim 6 further characterized by and including thE step of: a. heating the structure in a second stage curing operation for a time sufficient to cause expansion of said film and opening of cellular structure on the outer surface of the film whereby a sound deadening surface is formed.
Claim 11
Independent Claim
137 words
A method of fabricating insulated structures such as duct work, pipe and housings and the like from sheet or strip material, comprising the steps of: a. applying a thin film of expandable plastic to at least one side of an unformed sheet or strip of material, b. heating the strip or sheet of material in a first stage curing operation for a predetermined period of time sufficient to at least partially cure the plastic and cause it to be bonded to the sheet or strip but insufficient to cause noticeable expansion of the plastic, c. forming the sheet or strip of material into the desired structure, and d. heating the structure in a second stage curing operation for a predetermined period of time sufficient to cause said plastic film to expand at least several times in thickness.
Claim 12
Independent Claim
137 words
A method of fabricating insulated structures such as duct work, pipe and housings and the like from sheet or strip material, comprising the steps of: a. applying a thin film of expandable plastic to at least one side of an unformed sheet or strip of material, b. heating the strip or sheet of material in a first stage curing operation for a predetermined period of time sufficient to at least partially cure the plastic and cause it to be bonded to the sheet or strip but insufficient to cause noticeable expansion of the plastic, c. forming the sheet or strip of material into the desired structure, and d. heating the structure in a second stage curing operation for a predetermined period of time sufficient to cause said plastic film to expand at least several times in thickness.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |