US3109735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintering method
Assignee: Individual
•
Filing: 1961-10-30
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Granted: 1963-11-05
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Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 John M Googin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:32
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/1003; B22F3/1007
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
IN A METHOD OF MAKING A TUNGSTEN ARTICLE COMPRISING THE STEPS OF PACKING A TUNGSTEN POWDER INTO A DESIRED SHAPE, RAISING THE TEMPERATURE OF THE RESULTING POWDER COMPACT TO A SINTERING TEMPERATURE IN THE PRESENCE OF REDUCING GAS, AND MAINTAINING THE RESULTING HEATED COMPACT IN THE PRESENCE OF SAID REDUCING GAS AT SAID TEMPERATURE LONG ENOUGH TO SINTER SAID COMPACT, THE IMPROVEMENT COMPRISING ALTERNATELY INCREASING AND DECREASING THE PRESSURE OF SAID GAS THROUGHOUT THE COURSE OF THE STEPS OF RAISING THE TEMPERATURE OF SAID POWDER COMPACT AND MAINTAINING THE HEATED POWDER COMPACT AT A SINTERING TEMPERATURE.
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) | 1966-11-04 | 1967-05-06 | 1967-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-04 | 1971-05-06 | 1971-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-04 | 1975-05-06 | 1975-11-05 | $7700.00 | Window Closed / Lapsed |