US3140540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for connecting presemiflanged rungs to preapertured spaced ladder rails
Assignee: Individual
•
Filing: 1963-04-17
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Granted: 1964-07-14
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Expires: 1983-04-17
Abstract
No abstract record available.
Inventors
- 👤 Greenman Murry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:44
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; B21D39/063; E; E06; E06C; E06C7/00; E06C7/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/4992; Y10T29/49938; Y10T29/4994
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |