US4695694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure for minimizing microwave leakage
Assignee: Excelitas Noblelight America LLC
•
Filing: 1986-02-14
•
Granted: 1987-09-22
•
Expires: 2006-02-14
Abstract
Abstract Apparatus for using microwave energy to energize a light source which minimizes microwave leakage from a microwave cavity and yet permits a high percentage of light to be emitted from the cavity. The light transmitting window is made of two spaced-apart parallel screens having microwave energy absorbing material accessible to the zone between the two screens.
Inventors
- 👤 James D. Hill
- 👤 Gene R. Wooden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:44
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/76; H05B6/766
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
Apparatus for using microwave energy comprising walls defining a microwave cavity, said walls including a light window comprising an inner screen and a spaced-apart outer screen, each of said screens being substantially transparent to light and relatively opaque to microwave energy, said apparatus further including microwave absorbing material disposed between the two screens only at or near the periphery of the light window.
Claim 2
Dependent Claim
63 words
Apparatus for using microwave energy comprising walls defining a microwave cavity, said walls including a light window comprising an inner screen and a spaced-apart outer screen, each of said screens being substantially transparent to light and relatively opaque to microwave energy, said apparatus further including microwave absorbing material disposed between the two screens only at or near the periphery of the light window.
Claim 3
Dependent Claim
33 words
Apparatus in accordance with claim 1, wherein the distance between the inner screen and the outer screen is at least about 2 times the distance between adjacent parallel wires in the inner screen.
Claim 4
Dependent Claim
20 words
Apparatus in accordance with claim 1 wherein said outer screen is more transparent to light than is said inner screen.
Claim 5
Dependent Claim
29 words
Apparatus in accordance with claim 1 wherein the microwave absorbing means comprises microwave absorbing material disposed between the two screens at or near the periphery of the light window.
Claim 6
Dependent Claim
34 words
Apparatus in accordance with claim 1 wherein the microwave absorbing material is spaced from the zone between the screens and is in microwave communication with the zone between the two screens by waveguide means.
Claim 7
Dependent Claim
17 words
The apparatus of claim 1 wherein said microwave absorbing material is in the form of a ring.
Claim 8
Dependent Claim
80 words
A microwave light source comprising: a cavity comprising walls including a light window having an inner screen and a spaced-apart outer screen, each of said screens being substantially transparent to light and relatively opaque to microwave energy; microwave absorbing material disposed between the two screens only at or near the periphery of the light window; a bulb containing a plasma-forming medium within said cavity; microwave source means; and means for coupling microwave energy from said source means to said cavity.
Claim 9
Dependent Claim
80 words
A microwave light source comprising: a cavity comprising walls including a light window having an inner screen and a spaced-apart outer screen, each of said screens being substantially transparent to light and relatively opaque to microwave energy; microwave absorbing material disposed between the two screens only at or near the periphery of the light window; a bulb containing a plasma-forming medium within said cavity; microwave source means; and means for coupling microwave energy from said source means to said cavity.
Claim 10
Dependent Claim
19 words
The microwave light source of claim 7 wherein said microwave absorbing material is in the form of a ring.
References Cited (Backward Citations)
US2875435A
Cited
US2958754A
Cited
US3542939A
Cited
US3594531A
Cited
US3985993A
Cited
US4408255A
Cited
JPS58192458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |