US3450547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded silicate particles
Assignee: PQ Corp
•
Filing: 1966-04-05
•
Granted: 1969-06-17
•
Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Robert H Sams
- 👤 Newton W Mccready
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:43
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C04B18/00; C04B18/02; C04B18/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3184371A
Cited
US3150988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |