US3377660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making crystal abrasive
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1965-07-08
•
Granted: 1968-04-16
•
Expires: 1985-07-08
Abstract
No abstract record available.
Inventors
- 👤 Douglas W Marshall
- 👤 Edgar A Pett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:21
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/24; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |