US2903688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable signals
Assignee: Individual
•
Filing: 1957-03-25
•
Granted: 1959-09-08
•
Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 Roy M Sorensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:54
CPC Classifications
E; E01; E01F; E01F13/00; E01F13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1459104A
Cited
US1738401A
Cited
US1896578A
Cited
US2165562A
Cited
US2564145A
Cited
US2540341A
Cited
US2612548A
Cited
US2603698A
Cited
US2706809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |