Patent US3117552A successfully refreshed from Google Patents.
US3117552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic sound producing devices
Assignee: RAILWAY APPLIANCE RES Ltd
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Filing: 1961-10-05
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Granted: 1964-01-14
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Expires: 1981-10-05
Abstract
No abstract record available.
Inventors
- 👤 Robert E Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:17
CPC Classifications
G; G10; G10K; G10K9/00; G10K9/02; G10K9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A SOUND PRODUCING DEVICE HAVING A HORN FORMING A SOUND RESONANT COLUMN OPEN AT ONE END AND HAVING A SEATING RING AT THE OTHER END, SAID DEVICE INCLUDING AN ANNULAR CHAMBER SURROUNDING THE SEATING RING AND HAVING A DUCT FOR SUPPLYING FLUID UNDER PRESSURE TO SAID CHAMBER, A CLAMPING RING CARRIED BY THE DEVICE AND LOCATED CONCENTRICALLY OUTSIDE THE SEATING RING, THE COMBINATION COMPRISING A FIRST DIAPHRAGM ABUTTING THE CLAMPING RING AND THE SEATING, A SECOND DIAPHRAGM MOVABLE TOWARDS AND AWAY FROM THE FIRST DIAPHRAGM, A RESILIENT WASHER SPACING THE FIRST AND SECOND DIAPHRAGMS APART IN SUBSTANTIALLY PARALLEL RELATION AND FORMING A CLOSED COMPARTMENT THEREBETWEEN, A COVER PLATE SECURED TO THE DEVICE, SAID COVER PLATE ENCLOSING THE DIAPHRAGMS AND FORM-
Claim 2
Dependent Claim
121 words
IN A SOUND PRODUCING DEVICE HAVING A HORN FORMING A SOUND RESONANT COLUMN OPEN AT ONE END AND HAVING A SEATING RING AT THE OTHER END, SAID DEVICE INCLUDING AN ANNULAR CHAMBER SURROUNDING THE SEATING RING AND HAVING A DUCT FOR SUPPLYING FLUID UNDER PRESSURE TO SAID CHAMBER, A CLAMPING RING CARRIED BY THE DEVICE AND LOCATED CONCENTRICALLY OUTSIDE THE SEATING RING, THE COMBINATION COMPRISING A FIRST DIAPHRAGM ABUTTING THE CLAMPING RING AND THE SEATING, A SECOND DIAPHRAGM MOVABLE TOWARDS AND AWAY FROM THE FIRST DIAPHRAGM, A RESILIENT WASHER SPACING THE FIRST AND SECOND DIAPHRAGMS APART IN SUBSTANTIALLY PARALLEL RELATION AND FORMING A CLOSED COMPARTMENT THEREBETWEEN, A COVER PLATE SECURED TO THE DEVICE, SAID COVER PLATE ENCLOSING THE DIAPHRAGMS AND FORM-
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) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |