Patent US3606720A successfully refreshed from Google Patents.
US3606720A
Expired / Lapsed
US
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Roofing and siding sheets and the like and fastening means therefor
Assignee: Cookson Sheet Metal Developments Ltd
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Filing: 1969-02-17
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Granted: 1971-09-21
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Expires: 1989-02-17
Abstract
Abstract A ROOFING SHEET HAVING WIDE-BASED RIBS, A LATERAL MALE RIB HAVING MEANS FOR INTERLOCKING WITH AN OVERLYING LATERAL FEMALE RIB OF A NEIGHBOURING SHEET, THE MALE RIB HAVING A FIXING CHANNEL FOR SECURING THE RIB TO A STRUCTURAL MEMBER. THERE ARE ALSO DESCRIBED CLIPS TO ACT AS CONCEALED FIXINGS FOR INTERMEDIATE WIDEBASED RIBS, THE CLIPS HAVING MEANS TO ENGAGE AN INTERNAL POCKET OR POCKETS IN THE RIB.
Inventors
- 👤 William Cookson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:24
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/36; E04D3/3607; E04D3/24; E04D3/30; E04D3/361; E04D3/362; E04D3/363
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |