Patent US3349397A successfully refreshed from Google Patents.
US3349397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible radiation attenuator
Assignee: North American Aviation Corp
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Filing: 1966-02-03
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Granted: 1967-10-24
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Expires: 1986-02-03
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Rosenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:24
CPC Classifications
F; F41; F41H; F41H3/00; F41H3/02; H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A FLEXIBLE RADAR ATTENUATOR COMPRISING: A FLEXIBLE CONDUCTIVE SHEET; A PLURALITY OF FLEXIBLE ABSORBER SHEETS COEXTENSIVE WITH SAID CONDUCTIVE SHEET, EACH OF SAID ABSORBER SHEETS COMPRISING A FABRIC HAVING SEMICONDUCTIVE PARTICLES SECURED THERETO; A PLURALITY OF FLEXIBLE SPACER SHEETS COEXTENSIVE WITH SAID CONDUCTIVE SHEET, EACH OF SAID SPACER SHEETS COMPRISING A FLEXIBLE FOAM HAVING A THICKNESS IN THE SAME ORDER OF MAGNITUDE AS ONE-FOURTH OF THE WAVELENGTH OF RADIATION IN THE FREQUENCY RANGE OF RADAR, SAID SPACER SHEETS AND ABSORBER SHEETS LOOSELY OVERLYING EACH OTHER IN CONSECUTIVE ALTERNATION; AND
Claim 2
Dependent Claim
89 words
A FLEXIBLE RADAR ATTENUATOR COMPRISING: A FLEXIBLE CONDUCTIVE SHEET; A PLURALITY OF FLEXIBLE ABSORBER SHEETS COEXTENSIVE WITH SAID CONDUCTIVE SHEET, EACH OF SAID ABSORBER SHEETS COMPRISING A FABRIC HAVING SEMICONDUCTIVE PARTICLES SECURED THERETO; A PLURALITY OF FLEXIBLE SPACER SHEETS COEXTENSIVE WITH SAID CONDUCTIVE SHEET, EACH OF SAID SPACER SHEETS COMPRISING A FLEXIBLE FOAM HAVING A THICKNESS IN THE SAME ORDER OF MAGNITUDE AS ONE-FOURTH OF THE WAVELENGTH OF RADIATION IN THE FREQUENCY RANGE OF RADAR, SAID SPACER SHEETS AND ABSORBER SHEETS LOOSELY OVERLYING EACH OTHER IN CONSECUTIVE ALTERNATION; AND
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |