US3398994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid wheel control system for railway cars
Assignee: Westinghouse Air Brake Co
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Filing: 1966-09-14
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Granted: 1968-08-27
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Expires: 1986-09-14
Abstract
No abstract record available.
Inventors
- 👤 Robert D Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:35
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1705; B60T8/32; B60T8/321; B60T8/3235; B60T8/3245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A BRAKE CONTROL SYSTEM FOR A CAR, A BRAKE CONTROL FOR SAID CAR, AN ACCELEROMETER SECURED TO SAID CAR AND PROVIDING A FIRST SIGNAL REPRESENTING THE ACCELERATION OF SAID CAR, A RATE CONTROL FOR PROVIDING A SECOND SIGNAL INDICATIVE OF A DESIRED BRAKING CONTOUR FOR SAID CAR, MEANS FOR COMPARING SAID FIRST AND SECOND SIGNALS TO DERIVE AN ERROR SIGNAL, MEANS RESPONSIVE TO SAID ERROR SIGNAL FOR CONTROLLING BRAKING OF SAID CAR SO AS TO TEND TO MAINTAIN SAID BRAKING CONTROL BY CONTROLLING SAID BRAKE CONTROL, WHEREIN SAID ERROR SIGNAL HAS ALTERNATIVE CHARACTERS, A PROPULSION CONTROL, MEANS RESPONSIVE TO SAID ERROR SIGNAL SIGNAL WHEN OF ONE OF SAID ALTERNATIVE CHARACTERS FOR ACTUATING SAID PROPULSION CONTROL, AND MEANS RESPONSIVE TO SAID ERROR SIGNAL WHEN OF THE OTHER OF SAID ALTERNATIVE CHARACTERS FOR ACTUATING SAID BRAKE CONTROL.
Claim 2
Dependent Claim
136 words
IN A BRAKE CONTROL SYSTEM FOR A CAR, A BRAKE CONTROL FOR SAID CAR, AN ACCELEROMETER SECURED TO SAID CAR AND PROVIDING A FIRST SIGNAL REPRESENTING THE ACCELERATION OF SAID CAR, A RATE CONTROL FOR PROVIDING A SECOND SIGNAL INDICATIVE OF A DESIRED BRAKING CONTOUR FOR SAID CAR, MEANS FOR COMPARING SAID FIRST AND SECOND SIGNALS TO DERIVE AN ERROR SIGNAL, MEANS RESPONSIVE TO SAID ERROR SIGNAL FOR CONTROLLING BRAKING OF SAID CAR SO AS TO TEND TO MAINTAIN SAID BRAKING CONTROL BY CONTROLLING SAID BRAKE CONTROL, WHEREIN SAID ERROR SIGNAL HAS ALTERNATIVE CHARACTERS, A PROPULSION CONTROL, MEANS RESPONSIVE TO SAID ERROR SIGNAL SIGNAL WHEN OF ONE OF SAID ALTERNATIVE CHARACTERS FOR ACTUATING SAID PROPULSION CONTROL, AND MEANS RESPONSIVE TO SAID ERROR SIGNAL WHEN OF THE OTHER OF SAID ALTERNATIVE CHARACTERS FOR ACTUATING SAID BRAKE CONTROL.
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |