Patent US3388618A successfully refreshed from Google Patents.
US3388618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a high speed tool steel bar
Assignee: Simonds Saw and Steel Co
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Filing: 1966-06-30
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Granted: 1968-06-18
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Expires: 1986-06-30
Abstract
No abstract record available.
Inventors
- 👤 Evancic Ernest Andrew
- 👤 Campbell Kenneth Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:05
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THAT METHOD OF FORMING A HIGH SPEED TOOL STEEL BAR HAVING A SELECTED HEAT-HARDENED ZONE LONGITUDINALLY EMBRACING AN EDGE OF SAID BAR WHICH INCLUDES THE STEPS OF HEATING THE TOP OF AN OVERSIZE BAR OF HIGH SPEED TOOL STEEL PROGRESSIVELY LENGTHWISE OF THE BAR TO MELT THE BAR TO A CONTROLLED DEPTH PROGRESSIVELY ALONG A ZONE LYING BETWEEN AND SPACED INWARDLY FROM THE SIDE WALLS OF SAID BAR WHILE MAINTAINING SAID SIDE WALLS UNMELTED, COOLING THE MELTED STOCK PROGRESSIVELY LENGTHWISE OF THE STOCK TO RESOLIDIFY THE STOCK IN SAID ZONE AND THEREAFTER REMOVING MARGINAL SIDE WALL PORTIONS OF SAID STOCK TO FORM A NEWLY EXPOSED SIDE WALL SURFACE HAVING A TOP EDGE LYING WITHIN THE CONFINES OF SAID RESOLIDIFIED ZONE.
Claim 2
Dependent Claim
120 words
THAT METHOD OF FORMING A HIGH SPEED TOOL STEEL BAR HAVING A SELECTED HEAT-HARDENED ZONE LONGITUDINALLY EMBRACING AN EDGE OF SAID BAR WHICH INCLUDES THE STEPS OF HEATING THE TOP OF AN OVERSIZE BAR OF HIGH SPEED TOOL STEEL PROGRESSIVELY LENGTHWISE OF THE BAR TO MELT THE BAR TO A CONTROLLED DEPTH PROGRESSIVELY ALONG A ZONE LYING BETWEEN AND SPACED INWARDLY FROM THE SIDE WALLS OF SAID BAR WHILE MAINTAINING SAID SIDE WALLS UNMELTED, COOLING THE MELTED STOCK PROGRESSIVELY LENGTHWISE OF THE STOCK TO RESOLIDIFY THE STOCK IN SAID ZONE AND THEREAFTER REMOVING MARGINAL SIDE WALL PORTIONS OF SAID STOCK TO FORM A NEWLY EXPOSED SIDE WALL SURFACE HAVING A TOP EDGE LYING WITHIN THE CONFINES OF SAID RESOLIDIFIED ZONE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |