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US3475185A
Expired / Lapsed
US
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Alkali metal silicate binder for zinc-rich paints
Assignee: PQ Corp
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Filing: 1967-08-04
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Granted: 1969-10-28
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Expires: 1987-08-04
Abstract
No abstract record available.
Inventors
- 👤 Helmut Von Freyhold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26
Claims Analysis
Total Claims: 0
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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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |