Patent US3406785A successfully refreshed from Google Patents.
US3406785A
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US
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Ladder supporting surface compensating means
Assignee: WILLIAM B PILCHER
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Filing: 1966-12-27
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Granted: 1968-10-22
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Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 William B Pilcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3936; Y10T24/394; Y10T24/44; Y10T24/44291; Y10T24/44368
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) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |