US3231647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for corrugating sheets of fibrous cement
Assignee: Eurasbest AG
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Filing: 1960-06-07
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Granted: 1966-01-25
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Expires: 1980-06-07
Abstract
No abstract record available.
Inventors
- 👤 Oesterheld Karl Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/52; B28B1/528; B29; B29C; B29C53/00; B29C53/22; B29C53/24; B29C53/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A METHOD OF CORRUGATING PREFABRICATED FRESH SHEETS OF FIBROUS CEMENT ON A MOULDING STRUCTURE, COMPRISING THE STEPS OF PLACING A FLEXIBLE LAYER OF MATERIAL PENETRABLE BY AIR OVER A CORRUGATED APERTURED COVER OF A RIGID SUCTION BOX, EXPOSING SAID FLEXIBLE LAYER DURING THE ENTIRE CORRUGATING PROCEDURE TO THE INFLUENCE OF STRONG TENSIONAL FORCES ACTING IN THE TRANSVERSE DIRECTION, PLACING A PREFABRICATED FLAT FRESH SHEET OF FIBROUS CEMENT ON SAID FLEXIBLE LAYER, AND EXPOSING SAID SHEET OF FIBROUS CEMENT ON SAID FLEXIBLE LAYER TO THE ACTION OF A VACUUM INITIATED IN THE MIDDLE OF THE SHEET OF FIBROUS CEMENT AND ENLARGED PROGRESSIVELY TOWARDS THE LONGITUDINAL EDGE PORTIONS THEREOF TO DRAW SAID SHEET OF FIBROUS CEMENT ON SAID FLEXIBLE LAYER TOWARDS SAID COVER AND FORM CORRUGATIONS THEREIN, EACH INDIVIDUAL CORRUGATION BEING INITIALLY FORMED UNDER A LIGHT VACUUM OF ABOUT 30%, AFTER WHICH INITIAL FORMING THE CORRUGATION TROUGH ZONE IS ACTED UPON BY AN INCREASED VACUUM OF ABOUT 80%.
Claim 2
Independent Claim
156 words
A METHOD OF CORRUGATING PREFABRICATED FRESH SHEETS OF FIBROUS CEMENT ON A MOULDING STRUCTURE, COMPRISING THE STEPS OF PLACING A FLEXIBLE LAYER OF MATERIAL PENETRABLE BY AIR OVER A CORRUGATED APERTURED COVER OF A RIGID SUCTION BOX, EXPOSING SAID FLEXIBLE LAYER DURING THE ENTIRE CORRUGATING PROCEDURE TO THE INFLUENCE OF STRONG TENSIONAL FORCES ACTING IN THE TRANSVERSE DIRECTION, PLACING A PREFABRICATED FLAT FRESH SHEET OF FIBROUS CEMENT ON SAID FLEXIBLE LAYER, AND EXPOSING SAID SHEET OF FIBROUS CEMENT ON SAID FLEXIBLE LAYER TO THE ACTION OF A VACUUM INITIATED IN THE MIDDLE OF THE SHEET OF FIBROUS CEMENT AND ENLARGED PROGRESSIVELY TOWARDS THE LONGITUDINAL EDGE PORTIONS THEREOF TO DRAW SAID SHEET OF FIBROUS CEMENT ON SAID FLEXIBLE LAYER TOWARDS SAID COVER AND FORM CORRUGATIONS THEREIN, EACH INDIVIDUAL CORRUGATION BEING INITIALLY FORMED UNDER A LIGHT VACUUM OF ABOUT 30%, AFTER WHICH INITIAL FORMING THE CORRUGATION TROUGH ZONE IS ACTED UPON BY AN INCREASED VACUUM OF ABOUT 80%.
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |