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Patent US3443976A successfully refreshed from Google Patents.
US3443976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mineral grinding aids
Assignee: WR Grace and Co
•
Filing: 1965-10-14
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Granted: 1969-05-13
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Expires: 1985-10-14
Abstract
No abstract record available.
Inventors
- 👤 Vance H Dodson
- 👤 Frank G Serafin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:11
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/12; C04B24/128; C04B2103/00; C04B2103/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2857286A
Cited
US3042718A
Cited
US3088837A
Cited
US3305491A
Cited
US3278269A
Cited
US3325105A
Cited
US3329517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |