US3789419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate antenna with protective cover
Assignee: Individual
•
Filing: 1972-07-17
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Granted: 1974-01-29
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Expires: 1992-07-17
Abstract
Abstract A plate antenna as used, for example, in combination with a proximity door operator system has a capacitive signal plate situated between two shielding panels of fiber glass and cemented to such panels to form a unitary structure which, in turn, is placed below floor level so that anyone passing thereover increases the relative capacitive coupling necessary for related door actuation.
Inventors
- 👤 F Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:20
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/40; E; E05; E05F; E05F15/00; E05F15/70; E05F15/73; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A plate antenna assembly for use as a signal plate of a capacitance sensitive door operator for detecting a capacitance change caused by traffic thereabove, comprising a first upper disposed fiber glass shielding-like panel, a second lower disposed fiber glass shielding-like panel, and an intermediate electrically conductive plate-like antenna, said first upper panel being adhesively bonded to an upper side of said plate-like antenna, and said second lower panel being adhesively bonded to a lOwer side of said plate-like antenna, said upper and lower panels being of such dimensions as to extend peripherally beyond the peripheral edge of said plate-like antenna, said upper fiber glass panel having a cross-sectional thickness in the order of 0.035 inches, and said lower fiber glass panel having a crosssectional thickness in the order of 0.040 inches.
Claim 2
Dependent Claim
132 words
A plate antenna assembly for use as a signal plate of a capacitance sensitive door operator for detecting a capacitance change caused by traffic thereabove, comprising a first upper disposed fiber glass shielding-like panel, a second lower disposed fiber glass shielding-like panel, and an intermediate electrically conductive plate-like antenna, said first upper panel being adhesively bonded to an upper side of said plate-like antenna, and said second lower panel being adhesively bonded to a lOwer side of said plate-like antenna, said upper and lower panels being of such dimensions as to extend peripherally beyond the peripheral edge of said plate-like antenna, said upper fiber glass panel having a cross-sectional thickness in the order of 0.035 inches, and said lower fiber glass panel having a crosssectional thickness in the order of 0.040 inches.
Claim 3
Dependent Claim
19 words
A plate antenna assembly according to claim 1 wherein said intermediate electrically conductive plate-like mamber has a screen-like configuration.
Claim 4
Dependent Claim
70 words
A plate antenna assembly according to claim 1 wherein said upper and lower shielding-like panels and said intermediate plate-like antenna are encapsulated within encapsulating material comprising epoxy and silica sand, said silica sand comprising ''''Ottowa'''' silica sand of 40-80 mesh grain size, and said encapsulating material being effective to encapsulate said panels and said plate-like antenna and to secure said panels and said plate-like anntena to an associated receiving chamber.
References Cited (Backward Citations)
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Cited
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Cited
US3633206A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |