US3085649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladders
Assignee: Putnam Rolling Ladder Co Inc
•
Filing: 1962-08-21
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Granted: 1963-04-16
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Expires: 1982-08-21
Abstract
No abstract record available.
Inventors
- 👤 Edward T Gillman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:54
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A RAIL FOR USE IN A LADDER, SAID RAIL CONSISTING OF AN ELLIPTICALLY-SHAPED CORE FORMED OF TWO PARTS OF FOAMED POLYURETHANE MATERIAL AND A FLAT PARTITION OF ANOTHER MATERIAL DISPOSED FLATWISE BETWEEN SAID PARTS ON THE MAJOR AXIS OF THE ELLIPTICALLY-SHAPED CORE, AND THE WHOLE ENCLOSED IN A WRAPPING OF PLASTIC IMPREGNATED FIBERGLASS MATERIAL FORMING A HOMOGENEOUS RAIL STRUCTURE.
Claim 2
Dependent Claim
59 words
A RAIL FOR USE IN A LADDER, SAID RAIL CONSISTING OF AN ELLIPTICALLY-SHAPED CORE FORMED OF TWO PARTS OF FOAMED POLYURETHANE MATERIAL AND A FLAT PARTITION OF ANOTHER MATERIAL DISPOSED FLATWISE BETWEEN SAID PARTS ON THE MAJOR AXIS OF THE ELLIPTICALLY-SHAPED CORE, AND THE WHOLE ENCLOSED IN A WRAPPING OF PLASTIC IMPREGNATED FIBERGLASS MATERIAL FORMING A HOMOGENEOUS RAIL STRUCTURE.
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) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |