Patent US2829030A successfully refreshed from Google Patents.
Patent US2637671A successfully refreshed from Google Patents.
US2637671A
Expired / Lapsed
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Powder metallurgy method of making steel cutting tools
Assignee: Simonds Saw and Steel Co
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Filing: 1948-03-13
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Granted: 1953-05-05
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Expires: 1968-03-13
Abstract
No abstract record available.
Inventors
- 👤 Harry A Pavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T407/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
THE METHOD OF MAKING A STEEL SAW TOOTH COMPRISING MOLDING A COMPACT OF STEEL FORMING POWDERS AND SINTERING THE SAME, AND CHARACTERIZED IN NTHAT A PREDETERMINED AMOUNT OF POWDER COMPRISING DUCTILE IRON, GRAPHITE AND AN ALLOYABLE PERCENTAGE OF AN ALLOYING METAL SELECTED AND PROPORTIONED TO FORM A TOOL STEEL IS FED TO AN EXPANDED PRESSURE MOLD SHAPED TO FORM AN ELONGATE BODY TERMINATING AT ONE END IN A PORTION TAPERING TOWARDS A CUTTING EDGE AND POWDER FOR THE EDGE PORTION IS INITIALLY LOCATED REMOTE THEREFROM, AND WHEREIN PRESSURE IS APPLIED TO THE MOLD TO COMPRESS THE ELONGATE FACES OF THE TOOTH AND CAUSE SAID REMOTE POWDER TO FLOW LATERALLY AT AN ANGLE TO THE DIRECTION OF THE MOLD PRESSURE AND LENGTHWISE OF THE TOOTH DIRECTLY TOWARDS SAID TAPERING EDGE PORTION AND TO BE COMPACTED BY MOVEMENT ALONG A NARROWING PASSAGE PROGRESSIVELY TOWARDS THE EDGE AND PROVIDE A PROGRESSIVELY HIGHER DENSITY TOWARDS THE EDGE AND FORM A COMPACT DEVOID OF PRESSURE LAMINATIONS IN THE EDGE PORTION.
Claim 2
Independent Claim
165 words
THE METHOD OF MAKING A STEEL SAW TOOTH COMPRISING MOLDING A COMPACT OF STEEL FORMING POWDERS AND SINTERING THE SAME, AND CHARACTERIZED IN NTHAT A PREDETERMINED AMOUNT OF POWDER COMPRISING DUCTILE IRON, GRAPHITE AND AN ALLOYABLE PERCENTAGE OF AN ALLOYING METAL SELECTED AND PROPORTIONED TO FORM A TOOL STEEL IS FED TO AN EXPANDED PRESSURE MOLD SHAPED TO FORM AN ELONGATE BODY TERMINATING AT ONE END IN A PORTION TAPERING TOWARDS A CUTTING EDGE AND POWDER FOR THE EDGE PORTION IS INITIALLY LOCATED REMOTE THEREFROM, AND WHEREIN PRESSURE IS APPLIED TO THE MOLD TO COMPRESS THE ELONGATE FACES OF THE TOOTH AND CAUSE SAID REMOTE POWDER TO FLOW LATERALLY AT AN ANGLE TO THE DIRECTION OF THE MOLD PRESSURE AND LENGTHWISE OF THE TOOTH DIRECTLY TOWARDS SAID TAPERING EDGE PORTION AND TO BE COMPACTED BY MOVEMENT ALONG A NARROWING PASSAGE PROGRESSIVELY TOWARDS THE EDGE AND PROVIDE A PROGRESSIVELY HIGHER DENSITY TOWARDS THE EDGE AND FORM A COMPACT DEVOID OF PRESSURE LAMINATIONS IN THE EDGE PORTION.
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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) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |