US3916418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-reinforced molded reflector with metallic reflecting layer
Assignee: TDK Micronas GmbH
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Filing: 1974-01-02
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Granted: 1975-10-28
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Expires: 1994-01-02
Abstract
Abstract Large parabolic reflectors are constructed on-site from raw materials supplied in a kit, wherein the reflector is formed on an inflatable mold having a convex surface with appropriate contour. Upon inflating the mold, which may be impregnated or initially sprayed with a releasing agent, a layer of ultravioletsensitized polyester gel-coat or polyester resin is spray-applied thereon. Following this a predetermined number of layers of fiberglass-reinforced polyester resin are sprayed-on. Internal reinforcement ribbing pieces (e.g. plywood), having apertures therein and at least one surface corresponding in shape to the mold surface, are then radially arranged on the mold and held in place by polyester resin-sprayed fiberglass attachment fillets. Polyurethane foam is then applied, embedding and foaming in place the reinforcement pieces and also sectional pieces arranged piece by piece in concentric circles on the mold surface, with the apertures therein providing continuity between sections of cast polyurethane foam. Following this, a second laminate layer of fiberglass-reinforced polyester resin is sprayed-on. The mold is then deflated and a reflecting agent (e.g. aluminum) is sprayed onto the reflecting surface.
Inventors
- 👤 Manfred O Erdmann
- 👤 John J Dolan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:18
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; H01Q15/142; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C70/00; B29C70/04; B29C70/28; B29L; B29L2011/00; B29L2011/0083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
An antenna reflector having a reflecting surface of predetermined parameters comprising: a continuous layer of polyester material formed to a predetermined thickness on a surface having a curvature corresponding to the predetermined parameters of the reflector surface; a first layer of fiber-reinforced resinous laminate; a layer of foamed material impregnated with a plurality of internal reinforcement ribbing pieces of predetermined arrangement; a second layer of fiber-reinforced resinous laminate; and a continuous layer of metallic reflecting agent on the reflecting surface of said reflector; said fiber-reinforced resinous laminates being comprised of a predetermined number of layers of polyester resin and fiberglass; said continuous layer of polyester material being comprised of polyester resin spray-applied in a predetermined number of layers; said internal reinforcement ribbing pieces including lightweight radial stiffeners arranged on a mold surface radially outward from the center portion of said mold surface and reinforcing stiffeners sectionally arranged in concentric circles about said center portion, with both radially and concentrically arranged stiffeners having apertures therein for providing continuity between sections of the foamed material; and said radially and concentrically arranged stiffeners being constructed from inflatable rib structures sprayed with a fiber-reinforced resinous material.
Claim 2
Dependent Claim
192 words
An antenna reflector having a reflecting surface of predetermined parameters comprising: a continuous layer of polyester material formed to a predetermined thickness on a surface having a curvature corresponding to the predetermined parameters of the reflector surface; a first layer of fiber-reinforced resinous laminate; a layer of foamed material impregnated with a plurality of internal reinforcement ribbing pieces of predetermined arrangement; a second layer of fiber-reinforced resinous laminate; and a continuous layer of metallic reflecting agent on the reflecting surface of said reflector; said fiber-reinforced resinous laminates being comprised of a predetermined number of layers of polyester resin and fiberglass; said continuous layer of polyester material being comprised of polyester resin spray-applied in a predetermined number of layers; said internal reinforcement ribbing pieces including lightweight radial stiffeners arranged on a mold surface radially outward from the center portion of said mold surface and reinforcing stiffeners sectionally arranged in concentric circles about said center portion, with both radially and concentrically arranged stiffeners having apertures therein for providing continuity between sections of the foamed material; and said radially and concentrically arranged stiffeners being constructed from inflatable rib structures sprayed with a fiber-reinforced resinous material.
Claim 3
Dependent Claim
274 words
An antenna reflector having a reflecting surface of predetermined parameters comprising: a continuous layer of polyester material formed to a predetermined thickness on a surface having a curvature corresponding to the predetermined parameters of the reflector surface; a first layer of fiber-reinforced resinous laminate; a layer of foamed material impregnated with a plurality of internal reinforcement ribbing pieces of predetermined arrangement; a second layer of fiber-reinforced resinous laminate; and a continuous layer of metallic reflecting agent on the reflecting surface of said reflector; said fiber-reinforced resinous laminates being comprised of a predetermined number of layers of polyester resin and fiberglass; said continuous layer of polyester material being comprised of polyester resin spray-applied in a predetermined number of layers; said internal reinforcement ribbing pieces including lightweight radial stiffeners arranged on a mold surface radially outward from the center portion of said mold surface and reinforcing stiffeners sectionally arranged in concentric circles about said center portion, with both radially and concentrically arranged stiffeners having apertures therein for providing continuity between sections of the foamed material; the center portion of said mold surface corresponding to the vertex of said reflecting surface; a structural mount placed at the center of said mold surface which is embedded partially and foamed into place by said foamed material, said structural mount providing a means at the rear of said reflector for mounting same; and said structural mount including a base portion substantially flush with and contoured to said mold surface, a cylindrical body portion extending outward from the rear of said reflector on said base portion, and a top plate mounted on the outward extending end of said cylindrical body portion.
Claim 4
Dependent Claim
274 words
An antenna reflector having a reflecting surface of predetermined parameters comprising: a continuous layer of polyester material formed to a predetermined thickness on a surface having a curvature corresponding to the predetermined parameters of the reflector surface; a first layer of fiber-reinforced resinous laminate; a layer of foamed material impregnated with a plurality of internal reinforcement ribbing pieces of predetermined arrangement; a second layer of fiber-reinforced resinous laminate; and a continuous layer of metallic reflecting agent on the reflecting surface of said reflector; said fiber-reinforced resinous laminates being comprised of a predetermined number of layers of polyester resin and fiberglass; said continuous layer of polyester material being comprised of polyester resin spray-applied in a predetermined number of layers; said internal reinforcement ribbing pieces including lightweight radial stiffeners arranged on a mold surface radially outward from the center portion of said mold surface and reinforcing stiffeners sectionally arranged in concentric circles about said center portion, with both radially and concentrically arranged stiffeners having apertures therein for providing continuity between sections of the foamed material; the center portion of said mold surface corresponding to the vertex of said reflecting surface; a structural mount placed at the center of said mold surface which is embedded partially and foamed into place by said foamed material, said structural mount providing a means at the rear of said reflector for mounting same; and said structural mount including a base portion substantially flush with and contoured to said mold surface, a cylindrical body portion extending outward from the rear of said reflector on said base portion, and a top plate mounted on the outward extending end of said cylindrical body portion.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |