US3470720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow balls for use in ball bearing and/or similar rolling operations
Assignee: PHILLIP R EKLUND
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Filing: 1967-09-01
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Granted: 1969-10-07
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Expires: 1987-09-01
Abstract
No abstract record available.
Inventors
- 👤 Phillip R Eklund
- 👤 Gabe L Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/02; B21D51/08; F; F16; F16C; F16C33/00; F16C33/30; F16C33/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49679; Y10T29/49694
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |