US3442673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral grinding aids
Assignee: WR Grace and Co
•
Filing: 1966-06-02
•
Granted: 1969-05-06
•
Expires: 1986-06-02
Abstract
No abstract record available.
Inventors
- 👤 Frank G Serafin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:55
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/02; B; B02; B02C; B02C23/00; B02C23/06; C04B2103/00; C04B2103/52
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) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |