Patent US3270198A successfully refreshed from Google Patents.
US3270198A
Expired / Lapsed
US
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Highway crossing systems
Assignee: SPX Technologies Inc
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Filing: 1963-03-28
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Granted: 1966-08-30
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Expires: 1983-03-28
Abstract
No abstract record available.
Inventors
- 👤 Willis R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:39
CPC Classifications
B; B61; B61L; B61L29/00; B61L29/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A HIGHWAY CROSSING PROTECTION SYSTEM COMPRISING MEANS FOR GENERATING A PAIR OF SIGNALS RESPONSIVE TO PRESENCE OF A TRAIN ON EITHER SIDE OF A HIGHWAY CROSSING, A NETWORK OF APERTURED MAGNETIC CORES, MEANS UTILIZING THE SIGNALS FOR ALTERING REMANENT MAGNETIC STATES OF THE CORES, PULSE PRODUCING MEANS PROVIDING SIGNALS FOR READING OUT PULSES FROM THE NETWORK, RELAY MEANS FOR ACTUATING WARNING MEANS AT THE HIGHWAY CROSSING UPON DEENERGIZATION, AND SAFETY CORE MEANS COUPLING OUTPUT OF THE NETWORK TO THE RELAY MEANS AND REQUIRING OUTPUT FROM MORE THAN ONE CORE OF THE NETWORK IN ORDER TO ENERGIZE THE RELAY MEANS.
Claim 2
Dependent Claim
99 words
A HIGHWAY CROSSING PROTECTION SYSTEM COMPRISING MEANS FOR GENERATING A PAIR OF SIGNALS RESPONSIVE TO PRESENCE OF A TRAIN ON EITHER SIDE OF A HIGHWAY CROSSING, A NETWORK OF APERTURED MAGNETIC CORES, MEANS UTILIZING THE SIGNALS FOR ALTERING REMANENT MAGNETIC STATES OF THE CORES, PULSE PRODUCING MEANS PROVIDING SIGNALS FOR READING OUT PULSES FROM THE NETWORK, RELAY MEANS FOR ACTUATING WARNING MEANS AT THE HIGHWAY CROSSING UPON DEENERGIZATION, AND SAFETY CORE MEANS COUPLING OUTPUT OF THE NETWORK TO THE RELAY MEANS AND REQUIRING OUTPUT FROM MORE THAN ONE CORE OF THE NETWORK IN ORDER TO ENERGIZE THE RELAY MEANS.
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |