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Patent US3212775A successfully refreshed from Google Patents.
US3212775A
Expired / Lapsed
US
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Vacuum sheet control system
Assignee: Warren SD Co
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Filing: 1962-11-05
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Granted: 1965-10-19
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Expires: 1982-11-05
Abstract
No abstract record available.
Inventors
- 👤 Jr Ruel E Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:28
CPC Classifications
B; B65; B65H; B65H29/00; B65H29/70; B31; B31F; B31F1/00; B31F1/20; B31F1/22; D; D21; D21F; D21F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE METHOD OF STIFFENING TRAVELING FLEXIBLE SHEETS BY PRODUCING TEMPORARY CORRUGATIONS THEREIN COMPRISING THE STEPS OF TRANSPORTING SAID SHEETS SUCCESSIVELY IN A FLOW PATH, SUPPORTING SHETS ACROSS THE FULL WIDTH OF SAID PATH AT A PLURALITY OF LATERALLY SPACED LONGITUDINALLY EXTENDING AREAS, APPLYING DIFFERENTIAL AIR PRESSURE ACROSS ONLY PORTIONS OF SAID SHEETS BETWEEN THE SUPPORTING AREAS IN SAID PATH TO DEPRESS PORTIONS OF SAID SHEETS BETWEEN SAID AREAS, AND PROJECTING THE LEADING END OF SAID SHEET BEYOND SAID SUPPORTING AREAS IN SAID FLOW PATH WHILE MAINTAINING CORRUGATION OF SAID SHEET BY SAID DIFFERENTIAL AIR PRESSURE ON THE TRAILING END OF SAID SHEET UNTIL THE SHEET HAS PASSED BEYOND SAID SUPPORTING AREAS.
Claim 2
Independent Claim
111 words
THE METHOD OF STIFFENING TRAVELING FLEXIBLE SHEETS BY PRODUCING TEMPORARY CORRUGATIONS THEREIN COMPRISING THE STEPS OF TRANSPORTING SAID SHEETS SUCCESSIVELY IN A FLOW PATH, SUPPORTING SHETS ACROSS THE FULL WIDTH OF SAID PATH AT A PLURALITY OF LATERALLY SPACED LONGITUDINALLY EXTENDING AREAS, APPLYING DIFFERENTIAL AIR PRESSURE ACROSS ONLY PORTIONS OF SAID SHEETS BETWEEN THE SUPPORTING AREAS IN SAID PATH TO DEPRESS PORTIONS OF SAID SHEETS BETWEEN SAID AREAS, AND PROJECTING THE LEADING END OF SAID SHEET BEYOND SAID SUPPORTING AREAS IN SAID FLOW PATH WHILE MAINTAINING CORRUGATION OF SAID SHEET BY SAID DIFFERENTIAL AIR PRESSURE ON THE TRAILING END OF SAID SHEET UNTIL THE SHEET HAS PASSED BEYOND SAID SUPPORTING AREAS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |