US3187331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-wave absorber
Assignee: GAF Chemicals Corp
•
Filing: 1949-04-21
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Granted: 1965-06-01
•
Expires: 1969-04-21
Abstract
No abstract record available.
Inventors
- 👤 Beller Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN COMBINATION WITH A BODY HAVING NORMALLY A REFLECTING SURFACE OF HIGH CONDUCTIVITY AND HIGH PERMEABILITY WHICH, WHEN SUBJECTED TO HIGH-FREQUENCY ELECTROMAGNETIC WAVES, CAUSES REFLECTIONS OF EASILY DETECTABLE AMPLITUDES, MEANS FOR ALTERING SAID CONDUCTIVITY AND THEREBY SUBSTANTIALLY PREVENTING REFLECTIONS OF DETECTABLE MAGNITUDES COMPRISING A PROTECTIVE LAYER OF FINELY DIVIDED PARTICLES OF CARBONYL IRON POWDER HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 5 MICRONS, SAID LAYER DISPERSED IN AN INSULATING MEDIUM HAVING LOW DIELEECTRIC CONSTANT, LOW PERMEABILITY, AND EXHIBITING NO COHESION BETWEEN INDIVIDUAL PARTICLES.
Claim 2
Dependent Claim
83 words
IN COMBINATION WITH A BODY HAVING NORMALLY A REFLECTING SURFACE OF HIGH CONDUCTIVITY AND HIGH PERMEABILITY WHICH, WHEN SUBJECTED TO HIGH-FREQUENCY ELECTROMAGNETIC WAVES, CAUSES REFLECTIONS OF EASILY DETECTABLE AMPLITUDES, MEANS FOR ALTERING SAID CONDUCTIVITY AND THEREBY SUBSTANTIALLY PREVENTING REFLECTIONS OF DETECTABLE MAGNITUDES COMPRISING A PROTECTIVE LAYER OF FINELY DIVIDED PARTICLES OF CARBONYL IRON POWDER HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 5 MICRONS, SAID LAYER DISPERSED IN AN INSULATING MEDIUM HAVING LOW DIELEECTRIC CONSTANT, LOW PERMEABILITY, AND EXHIBITING NO COHESION BETWEEN INDIVIDUAL PARTICLES.
References Cited (Backward Citations)
FR802728A
Cited
AU2271135A
Cited
US2594971A
Cited
US2599944A
Cited
US2418479A
Cited
US2436578A
Cited
US2464006A
Cited
US2544391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |