US3442222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of laying railroad tracks on concrete bases
Assignee: SWEDISH RAIL SYSTEM S R S S AB
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Filing: 1967-04-24
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Granted: 1969-05-06
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Expires: 1987-04-24
Abstract
No abstract record available.
Inventors
- 👤 Per-Erik Olson
- 👤 Nils Lunden
- 👤 Sigwid Ribbing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
E; E01; E01B; E01B3/00; E01B3/28; E01B3/40; E01B1/00; E01B1/002; E01B1/004; E01B29/00; E01B29/02
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) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |