US4206170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding a torus shaped article
Assignee: Goodyear Tire and Rubber Co
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Filing: 1975-05-06
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Granted: 1980-06-03
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Expires: 1995-05-06
Abstract
Abstract A torus shaped article can be molded using a liquid injection molding composition by placing a torus shaped mold at an angle of 1° to 45° with the horizontal, charging the mold at a port having a higher elevation and immediately rotating the mold to position the vent port at a point higher than the charging port.
Inventors
- 👤 William O. Sassaman
- 👤 James M. Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:38
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/02; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8019; C08G2110/00; C08G2110/0008; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
In a method of molding a toroidal shaped article comprising the steps of injecting into a toroidal mold a liquid injection composition comprising a liquid polyurethane reaction mixture of a polyether polyol or polyester polyol, an organic polyisocyanate and a curative selected from the class consisting of glycol and diamine and curing said composition, the improvement comprising positioning a toroidal shaped mold at an angle of 1° to 45° with the horizontal, said mold having a charging port at a higher elevation, charging said mold through said port to permit the composition to flow around to a vent port opposite the charging port, immediately rotating the mold to position the vent port at a point higher than the charging port.
Claim 2
Dependent Claim
120 words
In a method of molding a toroidal shaped article comprising the steps of injecting into a toroidal mold a liquid injection composition comprising a liquid polyurethane reaction mixture of a polyether polyol or polyester polyol, an organic polyisocyanate and a curative selected from the class consisting of glycol and diamine and curing said composition, the improvement comprising positioning a toroidal shaped mold at an angle of 1° to 45° with the horizontal, said mold having a charging port at a higher elevation, charging said mold through said port to permit the composition to flow around to a vent port opposite the charging port, immediately rotating the mold to position the vent port at a point higher than the charging port.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the angle the mold makes with the horizontal is 3 to 15 degrees.
Claim 4
Dependent Claim
46 words
The method of claim 1 wherein the liquid injection composition is a mixture of an ethylene oxide capped propylene oxide adduct of trimethylol propane of about 5000 molecular weight, butanediol and a quasi-prepolymer of methane-(diphenyl isocyanate) and tripropylene ether glycol containing about 22 percent free NCO.
Claim 5
Dependent Claim
31 words
The method of claim 3 wherein the mold is rotated after charge of liquid injection composition to place the charging port at the lowest level with the mold in vertical position.
Claim 6
Dependent Claim
19 words
The method of claim 3 wherein the mold is rotated within 10 seconds of charging the liquid injection composition.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |