US4513459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleach cake in an improved bleach resistant particle retaining means
Assignee: Procter and Gamble Co
•
Filing: 1984-03-20
•
Granted: 1985-04-30
•
Expires: 2004-03-20
Abstract
Abstract An article of manufacture comprising a calcium hypochlorite cake composition in an improved particle retaining means which comprises a water-permeable polyvinyl chloride (PVC) bonded polyester (PET) filter sleeve which envelopes and supports the cake. The filter sleeve is designed to be rigid to avoid collapse in use, wicks water for improved cake contact, and is bleach resistant to insure a long product life.
Inventors
- 👤 Elexsis D. Doughty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:02
CPC Classifications
E; E03; E03D; E03D9/00; E03D9/02; E03D9/03; E03D9/033; E03D9/038; C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/688; C02F1/72; C02F1/76; E03D2009/024; Y; Y10; Y10S; Y10S206/00; Y10S206/819; Y10S8/00; Y10S8/04; Y10S8/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
An article of manufacture comprising a solid cake of water-soluble calcium hypochlorite: CHARACTERIZED IN THAT: a nonwoven water-permeable envelope contains said solid cake, said envelope made of a heat sealable substrate comprising a polyester fiber bonded with a polyvinyl chloride polymeric latex binder (PVC), said substrate having a basis weight of from 30 to 55 g/m 2 , and a weight ratio of said PVC/Polyester of about 20:80 to about 60:40; said substrate having a minimum wet bending value of 3 mm.
Claim 2
Dependent Claim
82 words
An article of manufacture comprising a solid cake of water-soluble calcium hypochlorite: CHARACTERIZED IN THAT: a nonwoven water-permeable envelope contains said solid cake, said envelope made of a heat sealable substrate comprising a polyester fiber bonded with a polyvinyl chloride polymeric latex binder (PVC), said substrate having a basis weight of from 30 to 55 g/m 2 , and a weight ratio of said PVC/Polyester of about 20:80 to about 60:40; said substrate having a minimum wet bending value of 3 mm.
Claim 3
Dependent Claim
14 words
The invention of claim 1 wherein said substrate has a positive dry wicking rate.
Claim 4
Dependent Claim
58 words
The invention of claim 1 wherein said PVC has a molecular weight of from 157,000 to 215,000 and said substrate has a basis weight of from 35 to 50 and said PVC/Polyester has a ratio of 45:55 to 55:5; said substrate having a wet bending value of at least 4 mm and a wicking rate of 100 sec.
Claim 5
Dependent Claim
27 words
The invention of claim 1 wherein said substrate has a porosity from 200 to 800 cfm/sq.ft. (about 61 to about 244 m 3 per min/m 2 ).
Claim 6
Dependent Claim
25 words
The invention of claim 3 wherein said porosity is from 200 to 650 cfm/sq.ft. (about 61 to about 198 m 3 per min/m 2 ).
Claim 7
Dependent Claim
25 words
The invention of claim 3 wherein said porosity is from 400 to 600 cfm/sq.ft. (about 122 to about 183 m 3 per min/m 2 ).
Claim 8
Dependent Claim
41 words
The invention of claim 1 wherein said PVC consists of (a) vinyl chloride acrylic latex having a MW of from about 157,000 to 183,000 and (b) vinyl chloride ethyl acrylate latex having a MW of from about 185,000 to about 215,000.
Claim 9
Dependent Claim
18 words
The invention of claim 7 wherein said (a) and (b) have a weight ratio of 45/55 to 55/45.
Claim 10
Dependent Claim
16 words
The invention of claim 1 wherein said substrate contains less than 1% of a crosslinking agent.
Claim 11
Dependent Claim
11 words
The invention of claim 9 wherein said crosslinking agent is hexamethoxymethylmelamine.
Claim 12
Dependent Claim
18 words
The invention of claim 10 wherein said substrate has a dry bending value of at least 4 mm.
References Cited (Backward Citations)
US2086937A
Cited
US3154495A
Cited
US4010306A
Cited
US4208747A
Cited
US4208747B1
Cited
US4281421A
Cited
US4307474A
Cited
US4305162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |