US3037953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of aqueous colloidal dispersions of polytetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1961-04-26
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Granted: 1962-06-05
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Expires: 1981-04-26
Abstract
No abstract record available.
Inventors
- 👤 Marks Barnard Mitchel
- 👤 Whipple George Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14; C08F6/20; Y; Y10; Y10S; Y10S260/00; Y10S260/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR CONCENTRATING AQUEOUS, COLLOIDAL DISPERSIONS OF POLYTETRAFLUOROETHYLENE WHICH COSISTS ESSENTIALLY OF THE STEPS OF (1) FORMING A MIXTURE BY ADDING TO AN AQUEOUS COLLOIDAL DISPERSION OF PARTICULES OF POLYTETRAFLUOROETHYLENE CONTAINING 30%-50% BY WEIGHT OF POLYMER SOLIDS AND CONTAINING 0.2%-0.4%, BASED ON THE WEIGHT OF SAID SOLIDS, OF AMMONIUM POLYFLUOROCARBOXYLATE HAVING 7-10 CARBON ATOMS PER MOLECULE, 0.01% TO 1.0% BY WEIGHT OF SAID DISPERSION OF A MEMBER OF THE GROUPS CONSISTINGOF SODIUM HYDROXIDE, AMMONIUM HYDRXIDE, AND AMMONIUM CARBONATE, AND 6%-12% BY WEIGHT OF SAID SOLIDS OF A NON-IONIC SURFACE-ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE FORMULA
Claim 2
Dependent Claim
101 words
A PROCESS FOR CONCENTRATING AQUEOUS, COLLOIDAL DISPERSIONS OF POLYTETRAFLUOROETHYLENE WHICH COSISTS ESSENTIALLY OF THE STEPS OF (1) FORMING A MIXTURE BY ADDING TO AN AQUEOUS COLLOIDAL DISPERSION OF PARTICULES OF POLYTETRAFLUOROETHYLENE CONTAINING 30%-50% BY WEIGHT OF POLYMER SOLIDS AND CONTAINING 0.2%-0.4%, BASED ON THE WEIGHT OF SAID SOLIDS, OF AMMONIUM POLYFLUOROCARBOXYLATE HAVING 7-10 CARBON ATOMS PER MOLECULE, 0.01% TO 1.0% BY WEIGHT OF SAID DISPERSION OF A MEMBER OF THE GROUPS CONSISTINGOF SODIUM HYDROXIDE, AMMONIUM HYDRXIDE, AND AMMONIUM CARBONATE, AND 6%-12% BY WEIGHT OF SAID SOLIDS OF A NON-IONIC SURFACE-ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE FORMULA
References Cited (Backward Citations)
US2478229A
Cited
US2559752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |