Patent US2972841A successfully refreshed from Google Patents.
US2972841A
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Method of universal preload grinding of duplex ball bearings
Assignee: NORMA HOFFMAN BEARINGS CORP
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Filing: 1958-07-31
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Granted: 1961-02-28
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Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Warren D Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:07
CPC Classifications
F; F16; F16C; F16C35/00; F16C35/04; F16C35/06; F16C35/061; B; B24; B24B; B24B7/00; B24B7/10; B24B7/16; F16C19/00; F16C19/02; F16C19/14; F16C19/16; F16C19/163; F16C19/54; F16C19/541; F16C19/542; F16C33/00; F16C33/30; F16C33/58; F16C33/64; F16C2229/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1722494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |