Patent US3328581A successfully refreshed from Google Patents.
US3328581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid transit speed control system
Assignee: Westinghouse Air Brake Co
•
Filing: 1966-06-16
•
Granted: 1967-06-27
•
Expires: 1986-06-16
Abstract
No abstract record available.
Inventors
- 👤 Crawford E Staples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:19
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
AN IMPROVED IMPEDANCE BOND FOR USE IN A TWO-RAIL RETURN TRACKWAY TRAIN SPEED CONTROL SYSTEM, (A) SAID IMPEDANCE BOND HAVING A PRIMARY CONDUCTOR MEANS ELECTRICALLY CONNECTED ACROSS SAID TWO-RAIL RETURN TRACKWAY, (B) AT LEAST TWO TOROIDAL CORE MEANS ENCIRCLING PORTIONS OF SAID PRIMARY CONDUCTOR MEANS OF SAID BOND, (C) SAID PRIMARY CONDUCTOR MEANS HAVING AT LEAST ONE T-SHAPED PORTION AND ONE OF SAID TOROIDAL CORE MEANS ENCIRCLING AT LEAST A PORTION OF ONE HALF OF THE CROSSPIECE ON SAID T-SHAPED PORTION, (D) SAID CORE MEANS HAVING AT LEAST ONE SECONDARY WINDING WHICH MAY BE UTILIZED IN THE TRANSMISSION AND RECEPTION TO AND FROM SAID TWO-RAIL RETURN TRACKWAY OF ALTERNATING CURRENT SIGNALS OF DIFFERENT FREQUENCIES.
Claim 2
Dependent Claim
114 words
AN IMPROVED IMPEDANCE BOND FOR USE IN A TWO-RAIL RETURN TRACKWAY TRAIN SPEED CONTROL SYSTEM, (A) SAID IMPEDANCE BOND HAVING A PRIMARY CONDUCTOR MEANS ELECTRICALLY CONNECTED ACROSS SAID TWO-RAIL RETURN TRACKWAY, (B) AT LEAST TWO TOROIDAL CORE MEANS ENCIRCLING PORTIONS OF SAID PRIMARY CONDUCTOR MEANS OF SAID BOND, (C) SAID PRIMARY CONDUCTOR MEANS HAVING AT LEAST ONE T-SHAPED PORTION AND ONE OF SAID TOROIDAL CORE MEANS ENCIRCLING AT LEAST A PORTION OF ONE HALF OF THE CROSSPIECE ON SAID T-SHAPED PORTION, (D) SAID CORE MEANS HAVING AT LEAST ONE SECONDARY WINDING WHICH MAY BE UTILIZED IN THE TRANSMISSION AND RECEPTION TO AND FROM SAID TWO-RAIL RETURN TRACKWAY OF ALTERNATING CURRENT SIGNALS OF DIFFERENT FREQUENCIES.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |