US3557274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for molding a concrete railroad tie
Assignee: J H Pomcroy & Co Inc
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Filing: 1968-03-27
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Granted: 1971-01-19
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Expires: 1988-03-27
Abstract
Abstract A CONCRETE POURING FORM ACCESSORY SUPPORTS A SLIDABLY REMOVABLE SLEEVE AND INSERT THREADED THERETO IN A MOLD OR POURING FORM DURING POURING OF A CONCRETE RAILROAD TIE. FOLLOWING HARDENING OF THE RAILROAD TIE, THE TIE IS READILY SLIDABLY REMOVED FROM THE SUPPORT POST THEREBY LEAVING THE SLEEVE INSERTED WITHIN THE INSERT TO PROTECT THREADS OF THE INSERT UNTIL THE SLEEVE HAS BEEN UNSCREWED FROM THE INSERT AT THE TIME OF BOLTING RAILS TO THE RAILROAD TIE. A RESILIENT ANNULAR CONE-SHAPED SEALING ELEMENT FORMS A PLUG BEHIND THE INSERT AND SLEEVE TO PRECLUDE THE APPLICATION OF BLOCKING CONCRETE BEHIND THE SLEEVE AND THE SUPPORT POST.
Inventors
- 👤 Edward L Kowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/02; E01B9/04; E01B9/14; E01B9/18; B; B28; B28B; B28B23/00; B28B23/005; E01B3/00; E01B3/28; E01B3/32; E01B3/34; E04; E04B; E04B1/00; E04B1/38; E04B1/41; E04B1/4114; E04B1/4121; E04G; E04G15/00; E04G15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |