Patent US2939309A successfully refreshed from Google Patents.
US2939309A
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US
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Method, apparatus and product for manufacturing separable stairs
Assignee: SANITARY PLASTICS Inc
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Filing: 1956-03-29
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Granted: 1960-06-07
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Expires: 1976-03-29
Abstract
No abstract record available.
Inventors
- 👤 Philip N Sitton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:33
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/104; E04F11/1042; E04F11/1043; E04F11/116
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2289439A
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US2558615A
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US2537396A
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US2697931A
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US2722823A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |