US3327255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interdigital band-pass filters
Assignee: Individual
•
Filing: 1963-03-06
•
Granted: 1967-06-20
•
Expires: 1983-03-06
Abstract
No abstract record available.
Inventors
- 👤 Bolljahn Harriette
- 👤 George L Matthaei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:45
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A STRIP-LINE MICROWAVE FILTER ADAPTED TO PASS A PRESCRIBED BAND OF FREQUENCIES COMPRISING A PAIR OF SPACED PARALLEL GROUND PLANES, SPACED PARALLEL METALLIC BLOCKS INTERMEDIATE SAID GROUND PLANES AND IN ELECTRICAL CONTACT THEREWITH, AN INTERDIGITAL LINE COMPRISING TWO INTERLEAVING SETS OF PARALLEL ARRANGED METALLIC BARS, ONE SET OF SAID BARS BEING AFFIXED TO ONE OF SAID METALLIC BLOCKS AND EXTENDING TOWARDS THE OTHER METALLIC BLOCK BUT TERMINATING SHORT OF SAID OTHER BLOCK, THE OTHER SET OF SAID BARS BEING AFFIXED TO SAID OTHER METALLIC BLOCK AND EXTENDING TOWARDS SAID ONE METALLIC BLOCK BUT TERMINATING SHORT THEREOF, EACH
Claim 2
Dependent Claim
97 words
A STRIP-LINE MICROWAVE FILTER ADAPTED TO PASS A PRESCRIBED BAND OF FREQUENCIES COMPRISING A PAIR OF SPACED PARALLEL GROUND PLANES, SPACED PARALLEL METALLIC BLOCKS INTERMEDIATE SAID GROUND PLANES AND IN ELECTRICAL CONTACT THEREWITH, AN INTERDIGITAL LINE COMPRISING TWO INTERLEAVING SETS OF PARALLEL ARRANGED METALLIC BARS, ONE SET OF SAID BARS BEING AFFIXED TO ONE OF SAID METALLIC BLOCKS AND EXTENDING TOWARDS THE OTHER METALLIC BLOCK BUT TERMINATING SHORT OF SAID OTHER BLOCK, THE OTHER SET OF SAID BARS BEING AFFIXED TO SAID OTHER METALLIC BLOCK AND EXTENDING TOWARDS SAID ONE METALLIC BLOCK BUT TERMINATING SHORT THEREOF, EACH
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |