US3737903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extremely thin, wave absorptive wall
Assignee: Individual
•
Filing: 1970-07-06
•
Granted: 1973-06-05
•
Expires: 1990-07-06
Abstract
Abstract An electromagnetic wave absorbing wall employing ferromagnetic ferrite and ferroelectric material. Much thinner walls of this construction are effective shields in contrast to the thick walls of lossy materials required to achieve equivalent shielding.
Inventors
- 👤 K Suetake
- 👤 Y Naito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:07
CPC Classifications
H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
An absorbing wall as in claim 1 further including a gap between said two layers, said gap containing dielectric material.
References Cited (Backward Citations)
US3309704A
Cited
US3540047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |