Patent US3480425A successfully refreshed from Google Patents.
US3480425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing the pyrophoricity of metallic powders
Assignee: Cabot Corp
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Filing: 1966-05-24
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Granted: 1969-11-25
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Expires: 1986-05-24
Abstract
No abstract record available.
Inventors
- 👤 John F Hardy
- 👤 Leonard H Doppler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:10
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR REDUCING THE PYROPHORIC CHARACTER OF PYROPHORIC METALLIC POWDERS WHICH COMPRISES CONTACTING SAID POWDER AT TEMPERATURES BELOW ABOUT -20*C. WITH A GAS CHEMICALLY INERT WITH RESPECTO SAID METAL AND CHOSEN FROM THE GROUP CONSISTING OF CARBON DIOXIDE, CARBON MONOXIDE, SULFUR DIOXIDE, SULFUR TRIOXIDE, HYDROGEN SULFIDE, AMMONIA AND THE HALOGENS.
Claim 2
Dependent Claim
51 words
A PROCESS FOR REDUCING THE PYROPHORIC CHARACTER OF PYROPHORIC METALLIC POWDERS WHICH COMPRISES CONTACTING SAID POWDER AT TEMPERATURES BELOW ABOUT -20*C. WITH A GAS CHEMICALLY INERT WITH RESPECTO SAID METAL AND CHOSEN FROM THE GROUP CONSISTING OF CARBON DIOXIDE, CARBON MONOXIDE, SULFUR DIOXIDE, SULFUR TRIOXIDE, HYDROGEN SULFIDE, AMMONIA AND THE HALOGENS.
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) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |