Patent US2957791A successfully refreshed from Google Patents.
US2957791A
Expired / Lapsed
US
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Opaque porous pressure-clarifiable films of addition polymers
Assignee: EIDP Inc
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Filing: 1960-01-21
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Granted: 1960-10-25
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Expires: 1980-01-21
Abstract
No abstract record available.
Inventors
- 👤 Bechtold Max Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
B; B29; B29D; B29D7/00; B29C; B29C67/00; B29C67/20; B29C67/202; C; C08; C08K; C08K5/00; C08K5/16; C08K5/20; Y; Y10; Y10S; Y10S424/00; Y10S424/07; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
AN OPAQUE FILM COMPOSED OF PARTIALLY COALESCED DISCRETE PARTICLES OF A HYDROPHOBIC ORGANIC ADDITION POLYMER HAVING A WHOLLY CARBON CHAIN, A MOLECULAR WEIGHT OF AT LEAST 10,000 AND BEING TAKEN FROM THE GROUP CONSISTING OF VINYL AND VINYLIDENE ADDITION POLYMERS, SAID FILM HAVING AN OPEN-CELL STRUCTURE CHARACTERIZED BY MICROSCOPIC VOIDS COMMUNICATING WITH THE SURFACE AND CONTAINING 20% TO 80% BY VOLUME OF OPEN-CELL PORES, SAID FILM HAVING A PERMEABILITY TO WATER VAPOR OF ABOUT 10 TIMES GREATER THAN THAT OF CORRESPONDING NON-POROUS FILMS OF THE SAME POLYMER AND THICKNESS, THE OPACITY PER UNIT OF THICKNESS BEING SUCH THAT A FILM THICKNESS OF 3 MILS AND GREATER HAS A LIGHT-TRANSMISSION OF LESS THAN 10% AT 4000 A., AND INCREASED LIGHT TRANSMISSION AT LONGER WAVELENGTHS OF LIGHT, SAID FILM BEING CAPABLE OF SUSTAINING A PERMANENT REDUCTION IN THICKNESS OF AT LEAST 20% TOGETHER WITH SUBSTANTIALLY CLARIFICATION OF OPAQUENESS UNDER A PRESSURE OF 10,000 POUNDS PER SQUARE INCH AT ROOM TEMPERATURE.
Claim 2
Dependent Claim
158 words
AN OPAQUE FILM COMPOSED OF PARTIALLY COALESCED DISCRETE PARTICLES OF A HYDROPHOBIC ORGANIC ADDITION POLYMER HAVING A WHOLLY CARBON CHAIN, A MOLECULAR WEIGHT OF AT LEAST 10,000 AND BEING TAKEN FROM THE GROUP CONSISTING OF VINYL AND VINYLIDENE ADDITION POLYMERS, SAID FILM HAVING AN OPEN-CELL STRUCTURE CHARACTERIZED BY MICROSCOPIC VOIDS COMMUNICATING WITH THE SURFACE AND CONTAINING 20% TO 80% BY VOLUME OF OPEN-CELL PORES, SAID FILM HAVING A PERMEABILITY TO WATER VAPOR OF ABOUT 10 TIMES GREATER THAN THAT OF CORRESPONDING NON-POROUS FILMS OF THE SAME POLYMER AND THICKNESS, THE OPACITY PER UNIT OF THICKNESS BEING SUCH THAT A FILM THICKNESS OF 3 MILS AND GREATER HAS A LIGHT-TRANSMISSION OF LESS THAN 10% AT 4000 A., AND INCREASED LIGHT TRANSMISSION AT LONGER WAVELENGTHS OF LIGHT, SAID FILM BEING CAPABLE OF SUSTAINING A PERMANENT REDUCTION IN THICKNESS OF AT LEAST 20% TOGETHER WITH SUBSTANTIALLY CLARIFICATION OF OPAQUENESS UNDER A PRESSURE OF 10,000 POUNDS PER SQUARE INCH AT ROOM TEMPERATURE.
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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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |