Patent US3290680A successfully refreshed from Google Patents.
US3290680A
Expired / Lapsed
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Electromagnetic wave absorber and processes for producing and using the same
Assignee: Eltro GmbH and Co
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Filing: 1963-08-06
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Granted: 1966-12-06
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Expires: 1983-08-06
Abstract
No abstract record available.
Inventors
- 👤 Wesch Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:05
CPC Classifications
H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
FOR AN ABSORBER OF ELECTROMAGNETIC WAVE ENERGY HAVING SUPERIMPOSED LAYERS OF DIFFERENT RELATIVE DIELECTRIC CONSTANTS, A METHOD OF PROTECTING THE ABSORBER FROM ICING CONDITIONS AND ADJUSTING THE HIGH FREQUENCY CONSTANT OF THE MATERIAL TO THEREBY TUNE THE DAMPING MAXIMUM, SAID METHOD COMPRISING EMBEDDING, IN A LAYER OF LOWER RELATIVE DIELECTRIC CONSTANT, HEATING WIRES ARRANGED IN SPACED PARALLEL RELATION IN THE FORM OF A GRID AND HEATING THE WIRES TO IN TURN HEAT THE ABSORBER.
Claim 2
Dependent Claim
74 words
FOR AN ABSORBER OF ELECTROMAGNETIC WAVE ENERGY HAVING SUPERIMPOSED LAYERS OF DIFFERENT RELATIVE DIELECTRIC CONSTANTS, A METHOD OF PROTECTING THE ABSORBER FROM ICING CONDITIONS AND ADJUSTING THE HIGH FREQUENCY CONSTANT OF THE MATERIAL TO THEREBY TUNE THE DAMPING MAXIMUM, SAID METHOD COMPRISING EMBEDDING, IN A LAYER OF LOWER RELATIVE DIELECTRIC CONSTANT, HEATING WIRES ARRANGED IN SPACED PARALLEL RELATION IN THE FORM OF A GRID AND HEATING THE WIRES TO IN TURN HEAT THE ABSORBER.
References Cited (Backward Citations)
US2298272A
Cited
US2992425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |