US2831313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring traveler
Assignee: EIDP Inc
•
Filing: 1955-01-10
•
Granted: 1958-04-22
•
Expires: 1975-01-10
Abstract
No abstract record available.
Inventors
- 👤 Robert J Burns
- 👤 James E Macafee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:34
CPC Classifications
D; D01; D01H; D01H7/00; D01H7/02; D01H7/52; D01H7/60; D01H7/604; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53287
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937676A
Cited
US2118873A
Cited
US2121647A
Cited
US2223774A
Cited
US2335121A
Cited
US2772535A
Cited
DE905828C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |