Patent US2854542A successfully refreshed from Google Patents.
Patent US3218199A successfully refreshed from Google Patents.
US3218199A
Expired / Lapsed
US
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Process for hardening metals using explosive means
Assignee: EIDP Inc
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Filing: 1963-08-14
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Granted: 1965-11-16
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Expires: 1983-08-14
Abstract
No abstract record available.
Inventors
- 👤 George R Cowan
- 👤 Arnold H Holtzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49806
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR HARDENING METALLIC SURFACES WHICH COMPRISES POSITIONED A THIN, FLEXIBLE METAL SHEET PARALLEL TO THE METAL SURFACE TO BE HARDENED AND ADJACENT THERETO BUT SEPARATED THEREFROM TO PROVIDE AN AIR SPACE BETWEEN SAID SURFACE AND SAID SHEET, PLACING A LAYER OF A DETONATING EXPLOSIVE ON THE EXTERIOR SURFACE OF SAID METAL SHEET, SAID LAYER OF EXPLOSIVE HAVING A VELOCITY OF DETONATION GREATER THAN ABOUT 125% OF THE SONIC VELOCITY OF THE SAID METALS, AND INITIATING SAID EXPLOSIVE LAYER, THE AMOUNT OF SAID EXPLOSIVE BEING SUFFICIENT TO PROPAGATE A DETONATION BUT SUFFICIENT TO DISINTEGRATE SAID METAL SHEET.
Claim 2
Dependent Claim
98 words
A PROCESS FOR HARDENING METALLIC SURFACES WHICH COMPRISES POSITIONED A THIN, FLEXIBLE METAL SHEET PARALLEL TO THE METAL SURFACE TO BE HARDENED AND ADJACENT THERETO BUT SEPARATED THEREFROM TO PROVIDE AN AIR SPACE BETWEEN SAID SURFACE AND SAID SHEET, PLACING A LAYER OF A DETONATING EXPLOSIVE ON THE EXTERIOR SURFACE OF SAID METAL SHEET, SAID LAYER OF EXPLOSIVE HAVING A VELOCITY OF DETONATION GREATER THAN ABOUT 125% OF THE SONIC VELOCITY OF THE SAID METALS, AND INITIATING SAID EXPLOSIVE LAYER, THE AMOUNT OF SAID EXPLOSIVE BEING SUFFICIENT TO PROPAGATE A DETONATION BUT SUFFICIENT TO DISINTEGRATE SAID METAL SHEET.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |