Patent US3271909A successfully refreshed from Google Patents.
US3271909A
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Grinding apparatus
Assignee: Unifrax I LLC
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Filing: 1964-03-13
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Granted: 1966-09-13
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Expires: 1984-03-13
Abstract
No abstract record available.
Inventors
- 👤 Richard D Rutt
- 👤 Adolph C Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/04; B24B21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A GRINDING APPARATUS COMPRISING: A GRINDING HEAD HAVING A DRIVEN ABRASIVE SURFACE; A WORKABLE SPACED BENEATH SAID GRINDING HEAD TO SUPPORT WORKPIECES FOR TREATMENT BY SAID ABRASIVE SURFACE; AN ELEVATOR MECHANISM FOR ADJUSTING THE RELATIVE VERTICAL POSITIONS BETWEEN THE WORKTABLE AND SAID ABRASIVE SURFACE; MEANS FOR SENSING THE VERTICAL POSITION OF THE UPPER SURFACE OF A WORKPIECE PLACED ON SAID WORKTABLE; AND
Claim 2
Dependent Claim
62 words
A GRINDING APPARATUS COMPRISING: A GRINDING HEAD HAVING A DRIVEN ABRASIVE SURFACE; A WORKABLE SPACED BENEATH SAID GRINDING HEAD TO SUPPORT WORKPIECES FOR TREATMENT BY SAID ABRASIVE SURFACE; AN ELEVATOR MECHANISM FOR ADJUSTING THE RELATIVE VERTICAL POSITIONS BETWEEN THE WORKTABLE AND SAID ABRASIVE SURFACE; MEANS FOR SENSING THE VERTICAL POSITION OF THE UPPER SURFACE OF A WORKPIECE PLACED ON SAID WORKTABLE; AND
References Cited (Backward Citations)
US2751722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |