US3353319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sheet-metal roof coverings and roof covering made in accordance with this method
Assignee: Fagersta AB
•
Filing: 1965-10-19
•
Granted: 1967-11-21
•
Expires: 1985-10-19
Abstract
No abstract record available.
Inventors
- 👤 Gronlund Sven Olof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:17
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/36; E04D3/361; E04D3/364; E04D1/00; E04D1/12; E04D1/18; E04D3/02; E04D3/16; E04D5/00; E04D5/04; E04D1/34; E04D2001/3452; E04D2001/3464; E04D2003/3615
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD OF MAKING ROOF COVERINGS FROM SHEET METAL, COMPRISING THE STEPS OF USING STRIPS OF STAINLESS STEEL HAVING A MAXIMUM THICKNESS OF 0.5 MM., BENDING MARGINAL PORTIONS OF SUCH STRIPS THROUGH AN ANGLE OF LESS THAN 87* AND MORE THAN 75* TO FORM UPSTANDING FLANGES, PLACING THE STRIPS ADJACENT ONE ANOTHER WITH THE FLANGE OF ONE STRIP ADJACENT A FLANGE OF ANOTHER STRIP, PRESSING THE ADJACENT FLANGES TOGETHER BY MEANS OF PRESSURE ROLLS, ELECTRIC RESISTANCE WELDING THE PRESSED FLANGES TOGETHER WHILE PLACING THE WELD AT A DISTANCE FROM THE EDGES OF THE FLANGES, AND FOLDING OVER THAT PART OF THE WELDED FLANGES WHICH IS LOCATED BETWEEN SAID EDGES AND THE WELD.
Claim 2
Independent Claim
112 words
A METHOD OF MAKING ROOF COVERINGS FROM SHEET METAL, COMPRISING THE STEPS OF USING STRIPS OF STAINLESS STEEL HAVING A MAXIMUM THICKNESS OF 0.5 MM., BENDING MARGINAL PORTIONS OF SUCH STRIPS THROUGH AN ANGLE OF LESS THAN 87* AND MORE THAN 75* TO FORM UPSTANDING FLANGES, PLACING THE STRIPS ADJACENT ONE ANOTHER WITH THE FLANGE OF ONE STRIP ADJACENT A FLANGE OF ANOTHER STRIP, PRESSING THE ADJACENT FLANGES TOGETHER BY MEANS OF PRESSURE ROLLS, ELECTRIC RESISTANCE WELDING THE PRESSED FLANGES TOGETHER WHILE PLACING THE WELD AT A DISTANCE FROM THE EDGES OF THE FLANGES, AND FOLDING OVER THAT PART OF THE WELDED FLANGES WHICH IS LOCATED BETWEEN SAID EDGES AND THE WELD.
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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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |