Patent US3284251A successfully refreshed from Google Patents.
US3284251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of surface hardening
Assignee: American Brake Shoe Co
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Filing: 1964-03-12
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Granted: 1966-11-08
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Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Farrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:02
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/667; C21D9/00; C21D9/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE METHOD OF SELECTIVELY QUENCHING A TREAD AND A PORTION OF THE FRONT RIM FACE AND FLANGE OF A PREHEATED RAILROAD CAR WHEEL, SAID METHOD COMPRISING: THE STEPS OF POSITIONING THE PREHEATED RAILROAD CAR WHEEL IN A HORIZONTAL POSITION WITH THE FLANGE THEREOF POSITIONED DOWNWARDLY, APPLYING A LIQUID QUENCHING MEDIUM TO THE TREAD OF THE CAR WHEEL, SAID QUENCHING MEDIUM MOVING ACROSS THE FLANGE OF THE CAR WHEEL AND MOVING ACROSS THE FRONT RIM FACE OF THE CAR WHEEL, AND DIRECTING A GASEOUS STREAM ACROSS THE FRONT RIM FACE OF THE CAR WHEEL TO FORM A BARRIER TO PREVENT THE LIQUID QUENCHING MEDIUM FROM FLOWING ONTO THE PLATE OF THE CAR WHEEL.
Claim 2
Independent Claim
112 words
THE METHOD OF SELECTIVELY QUENCHING A TREAD AND A PORTION OF THE FRONT RIM FACE AND FLANGE OF A PREHEATED RAILROAD CAR WHEEL, SAID METHOD COMPRISING: THE STEPS OF POSITIONING THE PREHEATED RAILROAD CAR WHEEL IN A HORIZONTAL POSITION WITH THE FLANGE THEREOF POSITIONED DOWNWARDLY, APPLYING A LIQUID QUENCHING MEDIUM TO THE TREAD OF THE CAR WHEEL, SAID QUENCHING MEDIUM MOVING ACROSS THE FLANGE OF THE CAR WHEEL AND MOVING ACROSS THE FRONT RIM FACE OF THE CAR WHEEL, AND DIRECTING A GASEOUS STREAM ACROSS THE FRONT RIM FACE OF THE CAR WHEEL TO FORM A BARRIER TO PREVENT THE LIQUID QUENCHING MEDIUM FROM FLOWING ONTO THE PLATE OF THE CAR WHEEL.
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |