US3216882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous plastic film
Assignee: ChampionX LLC
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Filing: 1960-12-05
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Granted: 1965-11-09
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Expires: 1980-12-05
Abstract
No abstract record available.
Inventors
- 👤 Charles A Feldt
- 👤 William G James
- 👤 Mindick Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/1016; H01M8/1018; H01M8/1058; H01M8/1062; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/003; B01D69/00; B01D69/02; H01M8/106; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y10; Y10S; Y10S521/00; Y10S521/905; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A POROUS PLASTIC FILM COMPRISING A HOMOGENEOUS DISPERSION OF A WATER-INSOLUBLE, ACID AND ALKALI RESISTANT THERMOPLASTIC POLYMER AND A SUBSTANTIALLYLINEAR WATERDISPERSIBLE POLYPOLAR POLYMER, SAID FILM BEING CHARACTERIZED BY A PLURALITY OF PORES EXTENDING THROUGHOUT AND PERFORATING AT LEAST ONE DIMENSION OF SAID PLASTIC FILM WITH THE INTERIOR SIZE OF THE PORES BEING RESTRICTED NEAR AT LEAST ONE POINT OF THEIR CONNECTION WITH AN EXTERIOR SURFACE OF SAID FILM, SAID PORES BEING FURTHER CHARACTERIZED AS HAVING AVERAGE INTERIOR DIAMETERS SUBSTANTIALLY GREATER THAN THE EXTERIOR SURFACE OPENINGS OF SAID PORES AND BEING THEREBY ADAPTABLE FOR SLOW RELEASE OF LIQUIDS CONTAINIED IN SAID PORES.
Claim 2
Dependent Claim
101 words
A POROUS PLASTIC FILM COMPRISING A HOMOGENEOUS DISPERSION OF A WATER-INSOLUBLE, ACID AND ALKALI RESISTANT THERMOPLASTIC POLYMER AND A SUBSTANTIALLYLINEAR WATERDISPERSIBLE POLYPOLAR POLYMER, SAID FILM BEING CHARACTERIZED BY A PLURALITY OF PORES EXTENDING THROUGHOUT AND PERFORATING AT LEAST ONE DIMENSION OF SAID PLASTIC FILM WITH THE INTERIOR SIZE OF THE PORES BEING RESTRICTED NEAR AT LEAST ONE POINT OF THEIR CONNECTION WITH AN EXTERIOR SURFACE OF SAID FILM, SAID PORES BEING FURTHER CHARACTERIZED AS HAVING AVERAGE INTERIOR DIAMETERS SUBSTANTIALLY GREATER THAN THE EXTERIOR SURFACE OPENINGS OF SAID PORES AND BEING THEREBY ADAPTABLE FOR SLOW RELEASE OF LIQUIDS CONTAINIED IN SAID PORES.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |