Patent US3290081A successfully refreshed from Google Patents.
Patent US1507515A successfully refreshed from Google Patents.
Patent US4399661A successfully refreshed from Google Patents.
Patent US3281772A successfully refreshed from Google Patents.
US3281772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low frequency electromagnetic hydrophone
Assignee: Individual
•
Filing: 1965-01-26
•
Granted: 1966-10-25
•
Expires: 1985-01-26
Abstract
No abstract record available.
Inventors
- 👤 Frank R Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:25
CPC Classifications
G; G10; G10K; G10K13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A HYDROPHONE ASSEMBLY COMPRISING: A PLURALITY OF MAGNETIC CIRCUIT INCLUDING TWO E-SHAPED CORES WITH COPLANAR POLE FACES AND FLATTENED ARMATURE BARS OF FERROMAGNETIC MATERIAL DISPOSED BETWEEN OPPOSING LEGS OF SAID E-SHAPED CORES, SUPPORT MEANS FOR PERMITTING RELATIVE MOTION OF SAID ARMATURE AND SAID POLE FACES TO VARY THE MAGNETIC RELUCTANCE OF THE MAGNETIC CIRCUITS IN EACH PAIR OF E-SHAPED LEGS, SAID SUPPORT MEANS COMPRISING LEAF SPRINGS WHICH ARE FLEXIBLE IN ONE DIRECTION ONLY BEING ATTACHED TO SAID BARS AND BEING SO SUPPORTED AT OPPOSITE ENDS AS TO PERMIT SAID BARS TO TRAVEL ONLY PARALLEL TO SAID COPLANAR POLE FACES, AN ELECTRIC CIRCUIT INDUCTIVELY COUPLED WITH THE TWO SLOTS OF EACH E-SHAPED CORE, AND AN ACOUSTIC DIAPHRAGM MECHANICALLY LINKED TO EACH ARMATURE TO PRODUCE RELATIVE MOTION AND INDUCE A VOLTAGE IN EACH OF SAID ELECTRICAL CIRCUITS.
Claim 2
Dependent Claim
135 words
A HYDROPHONE ASSEMBLY COMPRISING: A PLURALITY OF MAGNETIC CIRCUIT INCLUDING TWO E-SHAPED CORES WITH COPLANAR POLE FACES AND FLATTENED ARMATURE BARS OF FERROMAGNETIC MATERIAL DISPOSED BETWEEN OPPOSING LEGS OF SAID E-SHAPED CORES, SUPPORT MEANS FOR PERMITTING RELATIVE MOTION OF SAID ARMATURE AND SAID POLE FACES TO VARY THE MAGNETIC RELUCTANCE OF THE MAGNETIC CIRCUITS IN EACH PAIR OF E-SHAPED LEGS, SAID SUPPORT MEANS COMPRISING LEAF SPRINGS WHICH ARE FLEXIBLE IN ONE DIRECTION ONLY BEING ATTACHED TO SAID BARS AND BEING SO SUPPORTED AT OPPOSITE ENDS AS TO PERMIT SAID BARS TO TRAVEL ONLY PARALLEL TO SAID COPLANAR POLE FACES, AN ELECTRIC CIRCUIT INDUCTIVELY COUPLED WITH THE TWO SLOTS OF EACH E-SHAPED CORE, AND AN ACOUSTIC DIAPHRAGM MECHANICALLY LINKED TO EACH ARMATURE TO PRODUCE RELATIVE MOTION AND INDUCE A VOLTAGE IN EACH OF SAID ELECTRICAL CIRCUITS.
References Cited (Backward Citations)
US2886794A
Cited
US2391678A
Cited
US2638577A
Cited
US2770782A
Cited
US2903673A
Cited
US2962695A
Cited
US2842689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |