US3328580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid transit speed control system
Assignee: Westinghouse Air Brake Co
•
Filing: 1964-07-14
•
Granted: 1967-06-27
•
Expires: 1984-07-14
Abstract
No abstract record available.
Inventors
- 👤 Crawford E Staples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
B; B61; B61L; B61L23/00; B61L23/08; B61L23/14; B61L23/16; B61L23/168
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A TRAIN SPEED CONTROL SYSTEM FOR A TRACK DIVIDED INTO A PLURALITY OF SECTIONS, SAID STSTEM COMPRISING: (A) MEANS FOR SUPPLYING A CODED ENERGY SIGNAL OF A FIRST FREQUENCY TO THE TRACK RAILS ADJACENT THE EXIT END OF ONE OF SAID SECTIONS; (B) MEANS FOR SUPPLYING A CODED ENERGY SIGNAL OF AT LEAST ONE OTHER FREQUENCY TO THE TRACK RAILS AT A POINT WITHIN SAID ONE SECTION;
Claim 2
Dependent Claim
67 words
A TRAIN SPEED CONTROL SYSTEM FOR A TRACK DIVIDED INTO A PLURALITY OF SECTIONS, SAID STSTEM COMPRISING: (A) MEANS FOR SUPPLYING A CODED ENERGY SIGNAL OF A FIRST FREQUENCY TO THE TRACK RAILS ADJACENT THE EXIT END OF ONE OF SAID SECTIONS; (B) MEANS FOR SUPPLYING A CODED ENERGY SIGNAL OF AT LEAST ONE OTHER FREQUENCY TO THE TRACK RAILS AT A POINT WITHIN SAID ONE SECTION;
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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 |