US3394501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling grinding pressure
Assignee: Unifrax I LLC
•
Filing: 1965-06-17
•
Granted: 1968-07-30
•
Expires: 1985-06-17
Abstract
No abstract record available.
Inventors
- 👤 Adolph C Carlson
- 👤 Richard D Rutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:22
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/16; B24B21/00; B24B21/04; B24B21/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3118254A
Cited
US2168596A
Cited
US2648176A
Cited
US2925691A
Cited
US3100954A
Cited
US3271909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |