Patent US3793302A successfully refreshed from Google Patents.
US3793302A
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Film-forming composition comprising a silica-urea formaldehyde polymer flatting agent
Assignee: Cabot Corp
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Filing: 1972-11-24
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Granted: 1974-02-19
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Expires: 1992-11-24
Abstract
Abstract THIS DISCLOSURE RELATES TO THE USE OF A COMBINATION OF NON-POROUS MATERIALS COMPRISING A CERTAIN GROUP OF UREAFORMALDEHYDE POLYMERS AND A CERTAIN GROUP OF PYROGENICALLY PREPARED COLLOIDAL SILICAS AS FLATTING ADDITIVES IN THE PREPARATION OF FLATTED COMPOSITIONS SUCH AS PAINTS, LACQUERS, VARNISHES AND THE LIKE.
Inventors
- 👤 G Berstein
- 👤 J Hardy
- 👤 L Doppler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:05
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/16; C08K7/18; C08K3/00; C08K3/34; C08K3/36; C09; C09D; C09D7/00; C09D7/40; C09D7/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |