US2904448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filter paper heat sealable
Assignee: EDWIN V HADLEY
•
Filing: 1956-08-09
•
Granted: 1959-09-15
•
Expires: 1976-08-09
Abstract
No abstract record available.
Inventors
- 👤 Sorg Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:43
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF PROCESSING FILTER PAPER TO MAKE IT HEAT SEALABLE FOR USE IN INFUSION BAGS WHICH CONSISTS IN PROVIDING A MOLTEN SYNTHETIC PLASTIC MATERIAL FREE FROM VOLATILE SOLVENTS, PROVIDING A THIN, LIQUID-PERMEABLE SHEET OF FILTER TISSUR PAPER, PASSING SAID PAPER CONTINUOUSLY IN CONTACT WITH A CONTINUOUSLY MOVING STENCIL HAVING PERFORATIONS THEREIN WHICH PROVIDE DISCONTINUOUS AREAS IN A UNIFORM PATTERN THE ELEMENTS OF WHICH INTERSECT TRANSVERSE AND LONGITUDINAL LINES DRAWN ON SAID STENCIL, CAUSING SAID PLASTIC MATERIAL TO FLOW THROUGH SAID STENCIL AND ONTO SAID PAPER TO FORM SAID PATTERN ON THE CONTACTING FACE OF SAID PAPER, WHILE MAINTAINING THE OPPOSITE FACE OF SAID PAPER SUBSTANTIALLY FREE FEOM PLASTIC MATERIAL
Claim 2
Independent Claim
110 words
A METHOD OF PROCESSING FILTER PAPER TO MAKE IT HEAT SEALABLE FOR USE IN INFUSION BAGS WHICH CONSISTS IN PROVIDING A MOLTEN SYNTHETIC PLASTIC MATERIAL FREE FROM VOLATILE SOLVENTS, PROVIDING A THIN, LIQUID-PERMEABLE SHEET OF FILTER TISSUR PAPER, PASSING SAID PAPER CONTINUOUSLY IN CONTACT WITH A CONTINUOUSLY MOVING STENCIL HAVING PERFORATIONS THEREIN WHICH PROVIDE DISCONTINUOUS AREAS IN A UNIFORM PATTERN THE ELEMENTS OF WHICH INTERSECT TRANSVERSE AND LONGITUDINAL LINES DRAWN ON SAID STENCIL, CAUSING SAID PLASTIC MATERIAL TO FLOW THROUGH SAID STENCIL AND ONTO SAID PAPER TO FORM SAID PATTERN ON THE CONTACTING FACE OF SAID PAPER, WHILE MAINTAINING THE OPPOSITE FACE OF SAID PAPER SUBSTANTIALLY FREE FEOM PLASTIC MATERIAL
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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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |