US3607569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic mold means for molding steel-reinforced hollow bodies
Assignee: JOSEPH L GREENWELL
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Filing: 1969-03-24
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Granted: 1971-09-21
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Expires: 1989-03-24
Abstract
Abstract A mold of uniform thickness of nonmagnetic material for molding steel-reinforced laminar self-curing semifluid material into open side hollow bodies of substantially uniform thickness including a plurality of magnets distributed around the nonmolding side of the mold for urging by magnetic attraction through the mold perforated expanded or reticular steel reinforcement material into intimate and uniform engagement with each of a plurality of semicured layers of the molding material sequentially applied to the molding side of the mold to form a laminar steel-reinforced body of predetermined substantially uniform thickness when the material is cured.
Inventors
- 👤 Joseph L Greenwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:15
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/82; B29C33/00; B29C33/12; B29C33/14; B29C33/16; B29K; B29K2063/00; B29K2067/00; B29K2067/06; B29K2105/00; B29K2105/06; B29K2105/20; B29K2105/206; B29K2503/00; B29K2503/04; B29K2503/08; B29K2705/00; B29K2705/08; B29K2705/12; B29L; B29L2031/00; B29L2031/10; B29L2031/30; B29L2031/3067; B29L2031/307; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
33 words
The construction recited in claim 1 including a substantially uniform thin layer of parting material applied to the said inner surface of said mold prior to the application of said layer plastic material.
Claim 2
Dependent Claim
54 words
The construction recited in claim 1 including a predetermined number of layers of said plastic material applied to said first layer of said plastic material with an additional plurality of sheets of steel mesh material between each of said layers forming a one piece laminar body removable from said open side of said mold.
Claim 3
Dependent Claim
42 words
The construction recited in claim 1 wherein the said magnetic means comprise a plurality of like permanent magnets in spaced relation on the outside surface of said mold to produce an attractive said mAgnetic field force through the wall of said mold.
Claim 4
Dependent Claim
56 words
The construction recited in claim 1 including a plurality of electromagnets in spaced relation on the outside surface of said mold to produce an attractive said magnetic field force through the wall of said mold, a source of electric power, a circuit means connecting said source of energy with said electromagnets for producing said magnetic field.
Claim 5
Dependent Claim
15 words
The construction recited in claim 1 wherein said plastic material is a self-curing polyester resin.
Claim 6
Dependent Claim
135 words
A hollow mold of nonmagnetic material of substantially uniform thickness having an open side with the outer surface thereof having a predetermined form for shaping the internal surface of the body to be molded, A plurality of magnetic means in spaced relation on said inside surface of said hold mold to produce a magnetic field extending through said outer surface of said mold for attracting ferrous material toward said outside surface, a layer of self-curing plastic material of substantially uniform thickness applied to the outer surface of said plastic mold, a plurality of sheets of steel mesh materials for reinforcing said plastic material manually positioned on said layer of said plastic material for intimate engagement therein and urged into a like predetermined depth in said plastic material by the attractive force of said magnetic field.
Claim 7
Dependent Claim
21 words
The construction recited in claim 7 wherein the said plastic material is a self-curing semifluid cement base compound of high viscosity.
Claim 8
Dependent Claim
173 words
A hollow mold made of nonmagnetic material of substantially uniform thickness having an open side with the outside surface of said mold having a predetermined form for shaping the internal surface of the body to be molded, a plurality of electromagnets in spaced relation on the inside surface of said mold to produce a magnetic field extending through the said outside surface of said mold for attracting ferrous material toward said outside surface, a layer of self-curing plastic material of substantially uniform thickness applied to the outer surface of said mold, a source of electric energy, a circuit means connecting said source of energy to said electromagnets including a normally open electric switch in said circuit, a plurality of sheets of steel mesh material for reinforcing said plastic material manually positioned on said layer of said plastic material for intimate engagement therein and urged into like predetermined depth in said plastic material by the attractive force of said magnetic field when energized by the closure of said switch for a predetermined time period.
Claim 9
Dependent Claim
165 words
A hollow mold made of nonmagnetic material of substantially uniform thickness having an open side with the inside surface of said mold having a predetermined form for shaping the external surface of a body to be molded of substantially uniform thickness, a plurality of magnetic means positioned in spaced relation on the outside surface of said mold for producing a plurality of magnetic fields extending through said inside surface of said mold for attracting ferrous material toward said inside surface, a parting agent applied to the said inside surface of said mold, a layer of self-curing plastic material of substantially uniform thickness applied over said parting agent on the inner side of said mold, a plurality of sheets of iron wire cloth of predetermined mesh for reinforcing said plastic material manually positioned on said outer surface of said plastic material for intimate engagement on said inside surface and urged into substantially like predetermined depth in said plastic material by the attraction of said magnetic field.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |