US2996710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic radiation absorptive article
Assignee: EIDP Inc
•
Filing: 1945-09-20
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Granted: 1961-08-15
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Expires: 1965-09-20
Abstract
No abstract record available.
Inventors
- 👤 Pratt Burt Carlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:07
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0088; H01; H01Q; H01Q17/00; H01Q17/004; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
AN ELECTROMAGNETIC RADIATION-ABSORPTIVE ARTICLE HAVING SUBSTANTIALLY NO REFLECTIVITY TO ULTRA HIGH FREQUENCY ELECTROMAGNETIC WAVES, SAID ARTICLE COMPRISING A METALLIC BACKING ESSENTIALLY COMPLETELY REFLECTIVE TO SAID ELECTROMAGNETIC WAVES, AND A NEOPRENE FILM WHICH HAS A PREDETERMINED THICKNESS OF NOT LESS THAN ABOUT 25 MILS AND WHICH HAS A THICKNESS UNIFORMITY WITHIN $ 1.5% AND AN AVERAGE THICKNESS WITHIN $0.5% OF SAID PREDETERMINED THICKNESS ATTACHED TO SAID BACKING, SAID FILM HAVING UNIFORMLY INCORPORATED THEREIN FROM 8% TO 50% BY VOLUME THEREOF OF POWDERED CARBON HAVING AN ABSOLUTE DENSITY LESS THAN 3.
Claim 2
Dependent Claim
89 words
AN ELECTROMAGNETIC RADIATION-ABSORPTIVE ARTICLE HAVING SUBSTANTIALLY NO REFLECTIVITY TO ULTRA HIGH FREQUENCY ELECTROMAGNETIC WAVES, SAID ARTICLE COMPRISING A METALLIC BACKING ESSENTIALLY COMPLETELY REFLECTIVE TO SAID ELECTROMAGNETIC WAVES, AND A NEOPRENE FILM WHICH HAS A PREDETERMINED THICKNESS OF NOT LESS THAN ABOUT 25 MILS AND WHICH HAS A THICKNESS UNIFORMITY WITHIN $ 1.5% AND AN AVERAGE THICKNESS WITHIN $0.5% OF SAID PREDETERMINED THICKNESS ATTACHED TO SAID BACKING, SAID FILM HAVING UNIFORMLY INCORPORATED THEREIN FROM 8% TO 50% BY VOLUME THEREOF OF POWDERED CARBON HAVING AN ABSOLUTE DENSITY LESS THAN 3.
References Cited (Backward Citations)
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Cited
GB423876A
Cited
FR802728A
Cited
AU2271135A
Cited
US2239414A
Cited
US2332196A
Cited
US2335958A
Cited
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Cited
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Cited
US2464006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |