Patent US3519975A successfully refreshed from Google Patents.
Patent US5035886A successfully refreshed from Google Patents.
US5035886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active agent delivery device
Assignee: PPG Industries Inc
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Filing: 1990-05-10
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Granted: 1991-07-30
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Expires: 2010-05-10
Abstract
Abstract An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting pores; and (b) a releasable active agent or precursor thereof associated with at least a portion of the filler.
Inventors
- 👤 Paritosh M. Chakrabarti
- 👤 Harlan B. Johnson
- 👤 Malcolm Korach
- 👤 Dennis D. Leatherman
- 👤 Robert R. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; A; A01; A01N; A01N25/00; A01N25/18; A41; A41G; A41G1/00; A41G1/001; A41G1/006; A61; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/042; B; B29; B29C; B29C55/00; B29C55/005; B29K; B29K2105/00; B29K2105/04; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; C08J2201/0543; C08J2201/0545; C08J2201/0546; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable fragrance, flavor, or precursor thereof associated with at least a portion of said filler.
Claim 2
Dependent Claim
123 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable fragrance, flavor, or precursor thereof associated with at least a portion of said filler.
Claim 3
Dependent Claim
15 words
The active agent delivery device of claim 1 wherein said microporous material has been printed.
Claim 4
Dependent Claim
122 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable biocide or precursor thereof associated with at least a portion of said filler.
Claim 5
Dependent Claim
122 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable biocide or precursor thereof associated with at least a portion of said filler.
Claim 6
Dependent Claim
124 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable pheromone, other attractant, or precursor thereof associated with at least a portion of said filler.
Claim 7
Dependent Claim
124 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable pheromone, other attractant, or precursor thereof associated with at least a portion of said filler.
Claim 8
Dependent Claim
123 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable antistatic agent or precursor thereof associated with at least a portion of said filler.
Claim 9
Dependent Claim
123 words
An active agent delivery device which releases active agent over a prolonged period of time comprising: (a) microporous material comprising: (1) a matrix consisting essentially of essentially linear ultrahigh molecular weight polyethylene having an intrinsic viscosity of at least about 18 deciliters/gram, (2) finely divided particulate substantially water-insoluble filler, of which at least about 50 percent by weight is siliceous, distributed throughout said matrix, said filler constituting from about 50 percent to about 90 percent by weight of said microporous material, and (3) a network of interconnecting pores communicating throughout said microporous material, said pores constituting more than 35 percent by volume of said microporous material. (b) a releasable antistatic agent or precursor thereof associated with at least a portion of said filler.
References Cited (Backward Citations)
US2823421A
Cited
US2825640A
Cited
US2940830A
Cited
US2988440A
Cited
US3426754A
Cited
US3351495A
Cited
US3598122A
Cited
US3598123A
Cited
US3598122B1
Cited
US3920785A
Cited
US3985540A
Cited
US3885950A
Cited
US3707807A
Cited
US3742951B1
Cited
US3742951A
Cited
US3870593A
Cited
US3844865A
Cited
US4069161A
Cited
US3921636A
Cited
US4172066A
Cited
US3926188A
Cited
US4053580A
Cited
US4071508A
Cited
US4043921A
Cited
US4051086A
Cited
US4169014A
Cited
US4194041A
Cited
US4227911A
Cited
US4230105A
Cited
US4237083A
Cited
US4293565A
Cited
US4292301A
Cited
US4292302A
Cited
US4294820A
Cited
US4289749A
Cited
US4292303A
Cited
US4622356A
Cited
US4362737A
Cited
US4411893A
Cited
US4525340A
Cited
US4539256A
Cited
US4443511A
Cited
US4501793A
Cited
US4617359A
Cited
US4734229A
Cited
US4613544A
Cited
EP0191615A2
Cited
US4648417A
Cited
US4681750A
Cited
JPS62227932A
Cited
US4791144A
Cited
US4756844A
Cited
US4833172A
Cited
US4957787A
Cited
EP0322169A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |