Patent US3331825A successfully refreshed from Google Patents.
US3331825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluoroethylene molding powders
Assignee: Zeneca Inc
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Filing: 1963-11-05
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Granted: 1967-07-18
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Expires: 1983-11-05
Abstract
No abstract record available.
Inventors
- 👤 Tominaga Kenichi
- 👤 Mizushima Kunio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:25
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF IMPROVING THE RESISTANCE TO COALESCENCE OF POLYTETRAFLUOROETHYLENE MOLDING POWDERS WHICH COMPRISES UNIFORMLY ROTATING AND VIBRATING A POLYTETRAFLUOROETHYLENE POWDER IN A ROTARY MIXER FOR A PERIOD OF TIME SUFFICIENT (A) TO SMOOTH THE PARTICLE SURFACES WITHOUT SUBSTANTIALLY DECREASING PARTICLE SIZE, (B) TO INCREASE THE BULK DENSITY OF THE POWDER BY AT LEST 0.02 GRAM PER CUBIC CENTIMETER, AND (C) TO INCREASE ITS FLUIDIY, THEREBY IMPROVING THE RESISTANCE TO COALESCENCE OF THE POWDER.
Claim 2
Independent Claim
74 words
THE METHOD OF IMPROVING THE RESISTANCE TO COALESCENCE OF POLYTETRAFLUOROETHYLENE MOLDING POWDERS WHICH COMPRISES UNIFORMLY ROTATING AND VIBRATING A POLYTETRAFLUOROETHYLENE POWDER IN A ROTARY MIXER FOR A PERIOD OF TIME SUFFICIENT (A) TO SMOOTH THE PARTICLE SURFACES WITHOUT SUBSTANTIALLY DECREASING PARTICLE SIZE, (B) TO INCREASE THE BULK DENSITY OF THE POWDER BY AT LEST 0.02 GRAM PER CUBIC CENTIMETER, AND (C) TO INCREASE ITS FLUIDIY, THEREBY IMPROVING THE RESISTANCE TO COALESCENCE OF THE POWDER.
References Cited (Backward Citations)
GB638328A
Cited
US2936301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |