US3320664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of dispersion strengthened lead
Assignee: St. Joseph's Hospital and Medical Center
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Filing: 1965-04-19
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Granted: 1967-05-23
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Expires: 1985-04-19
Abstract
No abstract record available.
Inventors
- 👤 Krantz Tibor
- 👤 Evans David John Ivor
- 👤 Lund John Alfred Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:53
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0042; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD OF MAKING A HIGH TENSILE STRENGTH LEAD PRODUCT WHICH COMPRISES SUBJECTING PARTICLES OF METALLIC LEAD NOT EXCEEDING ABOUT 150 MILCRONS IN PARTICLE SIZE TO OXIDIZING CONDITIONS IN THE PRESENCE OF CONTROLLED AMOUNTS OF MOISTURE TO PRODUCE A COATING OF LEAD OXIDE THEREON AMOUNTING TO FROM ABOUT 1% TO ABOUT 16% BY WEIGHT CALCULATED AS PBO AND THEREAFTER SUBJECTING A PLURALITY OF SAID PARTICLES TO PLASTIC DEFORMATION TO COMMINUTE THE SO-FORMED LEAD OXIDE AND DISPERSE THE COMMINUTED LEAD OXIDE IN THE LEAD MATRIX FORMED BY THE ADHESION OF TH OXIDE FREE SURFACES OF THE PARTICLES.
Claim 2
Independent Claim
96 words
A METHOD OF MAKING A HIGH TENSILE STRENGTH LEAD PRODUCT WHICH COMPRISES SUBJECTING PARTICLES OF METALLIC LEAD NOT EXCEEDING ABOUT 150 MILCRONS IN PARTICLE SIZE TO OXIDIZING CONDITIONS IN THE PRESENCE OF CONTROLLED AMOUNTS OF MOISTURE TO PRODUCE A COATING OF LEAD OXIDE THEREON AMOUNTING TO FROM ABOUT 1% TO ABOUT 16% BY WEIGHT CALCULATED AS PBO AND THEREAFTER SUBJECTING A PLURALITY OF SAID PARTICLES TO PLASTIC DEFORMATION TO COMMINUTE THE SO-FORMED LEAD OXIDE AND DISPERSE THE COMMINUTED LEAD OXIDE IN THE LEAD MATRIX FORMED BY THE ADHESION OF TH OXIDE FREE SURFACES OF THE PARTICLES.
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) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |