US4030953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding fiberglass reflecting antenna
Assignee: Milliflect
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Filing: 1976-02-11
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Granted: 1977-06-21
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Expires: 1996-02-11
Abstract
Abstract Fiberglass antenna for reflecting electromagnetic radiation. The antenna includes metal reflecting surface embedded within the fiberglass. The antenna is fabricated in a heated, vacuum injected mold.
Inventors
- 👤 Joseph Fredrick Rutschow
- 👤 Bruno Zucconi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:02
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/36; B29C70/34; B29C70/345; B29C70/40; B29C70/42; B29C70/46; B29C70/48; B29C70/88; B29C70/882; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; H01Q15/142; B29C2791/00; B29C2791/004; B29C2791/006; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2105/12; B29K2105/128; B29K2105/20; B29K2105/206; B29K2705/00; B29K2709/00; B29K2709/08; B29K2995/00; B29K2995/0003; B29K2995/0005; B29L; B29L2009/00; B29L2031/00; B29L2031/34; B29L2031/3456
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
225 words
Method of fabricating a fiberglass reflecting antenna, comprising the steps of: a. spraying a gel coat layer into a first convex antenna mold, said first mold having a predetermined curvature; b. applying a layer of resin impregnated fiberglass cloth on top of the gel coat in the first convex mold; c. placing an electromagnetic reflecting surface on top of the layer of resin impregnated cloth; d. placing a plurality of layers of dry fiberglass woven roving into the first convex mold on top of the reflecting surface; spraying a gel coat layer into a second concave antenna mold, said second concave mold having both a shape and a predetermined curvature complimentary to said first convex mold; f. applying a layer of chopped fiberglass and resin on top of the gel coat layer in the second mold; g. anchoring a plurality of mounting brackets to said chopped fiberglass and resin layer in the second mold; h. placing said first convex mold and said second concave mold together; i. injecting resin into the space between said molds; j. pressing said molds together while the injected resin hardens so that the electromagnetic reflecting surface assumes the predetermined curvature of said molds; k. heating said molds to an elevated temperature that substantially relieves shrinkage induced stress in the fiberglass; and l. removing the antenna from the molds after cooling.
Claim 2
Dependent Claim
225 words
Method of fabricating a fiberglass reflecting antenna, comprising the steps of: a. spraying a gel coat layer into a first convex antenna mold, said first mold having a predetermined curvature; b. applying a layer of resin impregnated fiberglass cloth on top of the gel coat in the first convex mold; c. placing an electromagnetic reflecting surface on top of the layer of resin impregnated cloth; d. placing a plurality of layers of dry fiberglass woven roving into the first convex mold on top of the reflecting surface; spraying a gel coat layer into a second concave antenna mold, said second concave mold having both a shape and a predetermined curvature complimentary to said first convex mold; f. applying a layer of chopped fiberglass and resin on top of the gel coat layer in the second mold; g. anchoring a plurality of mounting brackets to said chopped fiberglass and resin layer in the second mold; h. placing said first convex mold and said second concave mold together; i. injecting resin into the space between said molds; j. pressing said molds together while the injected resin hardens so that the electromagnetic reflecting surface assumes the predetermined curvature of said molds; k. heating said molds to an elevated temperature that substantially relieves shrinkage induced stress in the fiberglass; and l. removing the antenna from the molds after cooling.
Claim 3
Dependent Claim
117 words
The method of claim 1 wherein the step of anchoring the mounting brackets further includes the steps of: a. inserting a plurality of mounting brackets into the layer of chopped fiberglass and resin in an area of the second concave mold having a circular, shoulder forming depression, said mounting brackets having mounting means positioned to protrude from the concave surface of the antenna; b. anchoring the plurality of mounting brackets to the layer of chopped fiberglass and resin by applying a second layer of chopped fiberglass and resin into the circular, shoulder forming depression; and c. filling the circular shoulder forming depression in the second antenna mold with foam so that voids are eliminated from the antenna.
References Cited (Backward Citations)
US2948896A
Cited
US3119109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |