US3411256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof construction and method thereof
Assignee: Dow Chemical Co
•
Filing: 1965-10-14
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Granted: 1968-11-19
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Expires: 1985-10-14
Abstract
No abstract record available.
Inventors
- 👤 John S Best
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:08
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/16; E04D13/1606; E04D13/1662; E04D11/00; E04D11/02; E04D3/00; E04D3/35; E04D3/351; E04D3/352; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249981
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3266206A
Cited
US3282008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |