Patent US4095000A successfully refreshed from Google Patents.
Patent US3562968A successfully refreshed from Google Patents.
US3562968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treating tool
Assignee: 3M Co
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Filing: 1969-03-12
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Granted: 1971-02-16
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Expires: 1989-03-12
Abstract
Abstract A ROTARY SURFACE TREATING TOOL HAVING A DRIVE ASSEMBLY AND A QUICK CHANGE ABRASIVE DISC OR OTHER SURFACE TREATING DEVICE. THE DRIVE ASSEMBLY HAS A HUB WITH A CYLINDRICAL CENTRAL OPENING HAVING AT LEAST TWO HELICAL RIDGED CAMS, AND THE BACK OF THE ABRASIVE DISC HAS A DRIVE BUTTON WITH HELICALLY GROOVED COMPLEMENTARY CAM FOLLOWERS. THE PITCH OF THE CAMS AND FOLLOWERS IS STEEP, SO THAT THE DISC CAN BE MOUNTED OR DEMOUNTED WITH NO MORE THAN ABOUT ONE HALF TURN.
Inventors
- 👤 Howard E Johnson
- 👤 Arlie M Knutson
- 👤 Vince Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:11
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/08; B24D9/085; B24B; B24B45/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |