Patent US4429954A successfully refreshed from Google Patents.
Patent US2641688A successfully refreshed from Google Patents.
US2641688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio echo pulse system for vehicles following a fixed route
Assignee: STC PLC
•
Filing: 1946-02-27
•
Granted: 1953-06-09
•
Expires: 1966-02-27
Abstract
No abstract record available.
Inventors
- 👤 Paul R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:53
CPC Classifications
B; B61; B61L; B61L3/00; B61L3/02; B61L3/08; B61L3/12; B61L3/125; B61L13/00; B61L13/04; B61L13/047; B61L3/16; B61L3/22; B61L3/225; G; G01; G01S; G01S1/00; G01S1/02; H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/17
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2460597A
Cited
US2510066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |