US2592147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Codispersions of polytetrafluoroethylene and hydrous oxides
Assignee: EIDP Inc
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Filing: 1947-05-23
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Granted: 1952-04-08
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Expires: 1967-05-23
Abstract
No abstract record available.
Inventors
- 👤 Carol K Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:49
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
AN AQUEOUS COLLOIDAL DISPERSION OF POLYTETRAFLUOROETHYLENE AND HYDRATED SILICA, SAID HYDRATED SILICA BEING PRESENT IN A PROPORTION OF 5%-50% BY WEIGHT BASED ON THE POLYTETRAFLUOROETHYLENE AND SAID POLYTETRAFLUOROETHYLENE AND HYDRATED SILICA BEING PRESENT AS COLLOIDAL PARTICLES NOT SUBSTANTIALLY OVER 0.2 MICRON IN SMALLEST DIMENSION AND 1 MICRON IN LARGEST DIMENSION.
Claim 2
Dependent Claim
50 words
AN AQUEOUS COLLOIDAL DISPERSION OF POLYTETRAFLUOROETHYLENE AND HYDRATED SILICA, SAID HYDRATED SILICA BEING PRESENT IN A PROPORTION OF 5%-50% BY WEIGHT BASED ON THE POLYTETRAFLUOROETHYLENE AND SAID POLYTETRAFLUOROETHYLENE AND HYDRATED SILICA BEING PRESENT AS COLLOIDAL PARTICLES NOT SUBSTANTIALLY OVER 0.2 MICRON IN SMALLEST DIMENSION AND 1 MICRON IN LARGEST DIMENSION.
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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |