US3298012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder warning device
Assignee: Individual
•
Filing: 1964-09-23
•
Granted: 1967-01-10
•
Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Weller Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:40
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/006; E06C7/003; G; G08; G08B; G08B13/00; G08B13/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A WARNING DEVICE FOR A MAIN LADDER OR THE LIKE HAVING STEPS WHICH A PERSON CAN CLIMB, SAID WARNING DEVICE COMPRISING A SIGNAL LADDER HAVING CROSS-MEMBERS POSITIONED ADJACENT SAID MAIN LADDER WITH THE TOP SURFACES OF SAID CROSS-MEMBERS NORMALLY SLIGHTLY ABOVE THE TOP SURFACES OF THE ADJACENT CORRESPONDING STEPS OF THE MAIN LADDER, RESILIENT SUPPORT MEANS FOR SAID SIGNAL LADDER WHICH PROVIDES FOR LIMITED VERTICAL MOVEMENT OF SAID SIGNAL LADDER WHILE MAINTAINING IT IN ITS NORMAL POSITION IN THE ABSENCE OF ANY EXTERNAL FORCE THEREON, AND SIGNAL MEANS OPERABLE BY MOVEMENT OF SAID SIGNAL LADDER FROM ITS NORMAL POSITION.
Claim 2
Dependent Claim
99 words
A WARNING DEVICE FOR A MAIN LADDER OR THE LIKE HAVING STEPS WHICH A PERSON CAN CLIMB, SAID WARNING DEVICE COMPRISING A SIGNAL LADDER HAVING CROSS-MEMBERS POSITIONED ADJACENT SAID MAIN LADDER WITH THE TOP SURFACES OF SAID CROSS-MEMBERS NORMALLY SLIGHTLY ABOVE THE TOP SURFACES OF THE ADJACENT CORRESPONDING STEPS OF THE MAIN LADDER, RESILIENT SUPPORT MEANS FOR SAID SIGNAL LADDER WHICH PROVIDES FOR LIMITED VERTICAL MOVEMENT OF SAID SIGNAL LADDER WHILE MAINTAINING IT IN ITS NORMAL POSITION IN THE ABSENCE OF ANY EXTERNAL FORCE THEREON, AND SIGNAL MEANS OPERABLE BY MOVEMENT OF SAID SIGNAL LADDER FROM ITS NORMAL POSITION.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |