Patent US4122146A successfully refreshed from Google Patents.
US4122146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible shell of plasticized polyvinyl chloride
Assignee: ITT Inc
•
Filing: 1975-01-09
•
Granted: 1978-10-24
•
Expires: 1995-01-09
Abstract
Abstract A unitary, three-dimensional flexible shell of plasticized polyvinyl chloride of substantially uniform thickness. The shell is produced by spraying a thin layer of a polyvinyl chloride plastigel comprising a dispersion of polyvinyl chloride in a plasticizer onto the surface of a three-dimensional mold corresponding to the outer face of the shell while the mold surface is maintained between room temperature and 100° C. The plastigel during use has a viscosity of 20,000 to 50,000 cps and at least 110,000 cps after 48 hours rest and contains no particles which are sedimentable at these viscosity levels. The layer of polyvinyl chloride is then heated in order to gel the layer.
Inventors
- 👤 Luigi Bertrandi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:55
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/08; Y; Y10; Y10S; Y10S264/00; Y10S264/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A method for producing a three-dimensional shell of plasticized PVC comprising preparing a polyvinyl chloride plastigel comprising a dispersion of polyvinyl chloride in a plasticizer, spraying a thin layer of said plastigel onto the surface of a three-dimensional mold while the mold surface is maintained between room temperature and 100° C., said plastigel having during use of viscosity of 20,000 to 50,000 cps, the viscosity of said plastigel being at least 100,000 cps after 48 hours rest, said plastigel containing no particles which are sedimentable at said viscosity levels, heating said layer to a temperature substantially above 100° C. in order to cure said layer of plastigel thereby forming a three-dimensional PVC shell, and removing said shell from said mold.
Claim 2
Independent Claim
120 words
A method for producing a three-dimensional shell of plasticized PVC comprising preparing a polyvinyl chloride plastigel comprising a dispersion of polyvinyl chloride in a plasticizer, spraying a thin layer of said plastigel onto the surface of a three-dimensional mold while the mold surface is maintained between room temperature and 100° C., said plastigel having during use of viscosity of 20,000 to 50,000 cps, the viscosity of said plastigel being at least 100,000 cps after 48 hours rest, said plastigel containing no particles which are sedimentable at said viscosity levels, heating said layer to a temperature substantially above 100° C. in order to cure said layer of plastigel thereby forming a three-dimensional PVC shell, and removing said shell from said mold.
Claim 3
Dependent Claim
19 words
The method of claim 1 in which the viscosity of the plastigel during use is 30,000 to 45,000 cps.
Claim 4
Dependent Claim
24 words
The method of claim 1 in which the surface of the mold is maintained during spraying at a temperature of at least 60° C.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the plastigel is agitated during spraying to maintain its viscosity during use at 20,000 to 50,000 cps.
Claim 6
Dependent Claim
20 words
The method of claim 1 having 40 to 60% by weight, based on the weight of polyvinyl chloride, of plasticizer.
Claim 7
Dependent Claim
53 words
The method of claim 1 for producing a shell having an integral textile insert in which a textile insert is maintained on a zone of the mold surface and the plastigel is sprayed onto the insert edges and the remaining surfaces of the mold to form a shell containing an integral textile insert.
Claim 8
Dependent Claim
24 words
The method of claim 5 in which the entire insert surface is sprayed with plastigel to form a shell containing an integral textile reinforcement.
Claim 9
Dependent Claim
63 words
The method of claim 1 for producing a multicolored shell having sharply -- demarcated zones of different colors in which a first zone of the mold surface is masked, the plastigel is sprayed onto the remaining zone of the mold surface with a plastigel of a given color, the first zone is unmasked and sprayed with a layer of plastigel of another color.
Claim 10
Dependent Claim
55 words
The method of claim 1 for producing a reinforced shell comprising the steps of spraying a part of the thickness of said layer of plastigel onto the surface of the mold, laying on the partial coat a grating of reinforcing fibers, and spraying plastigel through and onto said grating to complete the layer of plastigel.
References Cited (Backward Citations)
US2651586A
Cited
US3200085A
Cited
US3151196A
Cited
US3095259A
Cited
US3161436A
Cited
US3187073A
Cited
US3190944A
Cited
US3315016A
Cited
US3632545A
Cited
US3522686A
Cited
US3705228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |