Patent US3898770A successfully refreshed from Google Patents.
US3898770A
Expired / Lapsed
US
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Lapping fixture reference plate assembly
Assignee: Speedfam Corp
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Filing: 1974-11-25
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Granted: 1975-08-12
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Expires: 1994-11-25
Abstract
Abstract The reference plate assembly includes a horizontal reference plate having three circumferentially spaced apart vertical apertures. Insert units are vertically adjustably mounted in the apertures with the plane of the upper ends of the insert units lying below the plane of the upper surface of the plate and parallel to the plane of the lower surface of the plate. One reference plate assembly may be used interchangeably with any number of cooperating fixtures; any number of reference plate assemblies may be used interchangeably with one cooperating fixture.
Inventors
- 👤 Ernest A Benz
- 👤 James V Keefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:41
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/04; B24B37/07; B24B37/10; B24B37/102; B24B49/00; B24B49/02; C; C07; C07D; C07D219/00; C07D219/04; C07D219/08; C07D219/10; C07D219/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
For use in lap limiting fixture means, a reference plate assembly comprising a horizontal reference plate having an upper surface, a lower workpiece engaging surface, and three circumferentially spaced apart vertical apertures open at their upper ends; and insert units vertically adjustably mounted in said apertures with the plane of the upper ends of said insert units lying below the plane of said upper surface and parallel to the plane of said lower workpiece engaging surface.
Claim 2
Dependent Claim
76 words
For use in lap limiting fixture means, a reference plate assembly comprising a horizontal reference plate having an upper surface, a lower workpiece engaging surface, and three circumferentially spaced apart vertical apertures open at their upper ends; and insert units vertically adjustably mounted in said apertures with the plane of the upper ends of said insert units lying below the plane of said upper surface and parallel to the plane of said lower workpiece engaging surface.
Claim 3
Dependent Claim
30 words
The reference plate assembly of claim 1 wherein said apertures are provided with internal threads, and said insert units are provided with external threads threadingly engaged with said internal threads.
Claim 4
Dependent Claim
34 words
The reference plate assembly of claim 2 wherein said insert units each comprise a main body provided with said external threads, and a hardened insert secured in the upper end of said main body.
Claim 5
Dependent Claim
43 words
The reference plate assembly of claim 3 wherein said reference plate is formed with recessed annular shoulders about said apertures, and including lock nuts threaded on said main bodies below the plane of said upper surface and engaged with said recessed annular shoulders.
References Cited (Backward Citations)
US3090169A
Cited
US3388506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |