Patent US3240930A successfully refreshed from Google Patents.
US3240930A
Expired / Lapsed
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Retarder control systems
Assignee: American Brake Shoe Co
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Filing: 1965-01-13
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Granted: 1966-03-15
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Expires: 1985-01-13
Abstract
No abstract record available.
Inventors
- 👤 Richard E Porter
- 👤 Arthur R Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:31
CPC Classifications
B; B61; B61K; B61K7/00; B61K7/02; B61K7/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A SPEED-SENSITIVE CONTROL SYSTEM FOR A RAILWAY CAR RETARDER OR THE LIKE COMPRISING: A RAIL EXTENDING THROUGH A MAJOR PORTION OF THE LENGTH OF THE RETARDER HAVING A SERIES OF SURFACE DISCONTINUITIES AT PREDETERMINED SPACED INTERVALS ALONG THE RAIL IN POSITION TO BE ENGAGED BY A RAILWAY VEHICLE WHEEL MOVING ALONG THE RAIL; A PLURALITY OF INDIVIDUAL TRANSDUCERS MOUNTED ON SAID RAIL AT SPACED INTERVALS, FOR GENERATING INITIAL ELECTRICAL SIGNALS REPRESENTATIVE OF VIBRATION OF THE RAIL, SAID INITIAL SIGNALS INCLUDING REPETITIVE SIGNAL COMPONENTS AT FREQUENCIES DETERMINED CONJOINTLY BY THE SPACING BETWEEN SAID SURFACE DISCONTINUITIES AND THE SPEED OF A VEHICLE MOVING ALONG THE RAIL; AN AMPLITUDE-SENSITIVE SWITCHING DEVICE, CONNECTED TO SAID TRANSDUCERS, FOR SELECTING THE INITIAL SIGNAL OF THE GREATEST INSTANTANEOUS AMPLITUDE; FREQUENCY-SELECTIVE CONTROL MEANS, COUPLED TO SAID SWITCHING DEVICE FOR SELECTIVELY UTILIZING SAID RE-
Claim 2
Dependent Claim
135 words
A SPEED-SENSITIVE CONTROL SYSTEM FOR A RAILWAY CAR RETARDER OR THE LIKE COMPRISING: A RAIL EXTENDING THROUGH A MAJOR PORTION OF THE LENGTH OF THE RETARDER HAVING A SERIES OF SURFACE DISCONTINUITIES AT PREDETERMINED SPACED INTERVALS ALONG THE RAIL IN POSITION TO BE ENGAGED BY A RAILWAY VEHICLE WHEEL MOVING ALONG THE RAIL; A PLURALITY OF INDIVIDUAL TRANSDUCERS MOUNTED ON SAID RAIL AT SPACED INTERVALS, FOR GENERATING INITIAL ELECTRICAL SIGNALS REPRESENTATIVE OF VIBRATION OF THE RAIL, SAID INITIAL SIGNALS INCLUDING REPETITIVE SIGNAL COMPONENTS AT FREQUENCIES DETERMINED CONJOINTLY BY THE SPACING BETWEEN SAID SURFACE DISCONTINUITIES AND THE SPEED OF A VEHICLE MOVING ALONG THE RAIL; AN AMPLITUDE-SENSITIVE SWITCHING DEVICE, CONNECTED TO SAID TRANSDUCERS, FOR SELECTING THE INITIAL SIGNAL OF THE GREATEST INSTANTANEOUS AMPLITUDE; FREQUENCY-SELECTIVE CONTROL MEANS, COUPLED TO SAID SWITCHING DEVICE FOR SELECTIVELY UTILIZING SAID RE-
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |