Patent US3020831A successfully refreshed from Google Patents.
US3020831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for applying circumferential pressure on the periphery of a circular object
Assignee: Individual
•
Filing: 1958-09-04
•
Granted: 1962-02-13
•
Expires: 1978-09-04
Abstract
No abstract record available.
Inventors
- 👤 Oliver G Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:53
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US941543A
Cited
US978976A
Cited
US1167009A
Cited
FR496508A
Cited
US1246557A
Cited
US1738504A
Cited
US2253713A
Cited
US2317440A
Cited
US2434607A
Cited
US2682908A
Cited
US2712850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |