Patent US3754871A successfully refreshed from Google Patents.
US3754871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical dispensing apparatus
Assignee: Stewart-Hall Chemical Co
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Filing: 1971-01-22
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Granted: 1973-08-28
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Expires: 1991-01-22
Abstract
Abstract A simplified chemical dispenser apparatus capable of dispensing a predetermined amount of a treatment chemical into a fluid includes a porous matrix exhibiting capillary action when the fluid contacts a surface of the matrix, a fluid treatment chemical composition located on a surface of the matrix, and housing means for covering said chemical composition and at least said chemical bearing matrix surface to shield against dripping or splashing from the top or sides. The housing may be applied as an envelope in which case the chemical supported upon the matrix is sealed therein.
Inventors
- 👤 H Hessel
- 👤 F Kiele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:09
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/505; B01F; B01F21/00; B01F21/20; B01F21/22; B01J; B01J4/00; B01J4/02; C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/688
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
A chemical dispenser apparatus as recited in claim 1 further including means for rendering said apparatus positively buoyant formed with said housing means.
Claim 2
Dependent Claim
19 words
A chemical dispenser apparatus as recited in claim 1 wherein said capillary matrix comprises a porous polyurethane foam composition.
Claim 3
Dependent Claim
98 words
A chemical dispenser apparatus comprising a porous plastic capillary matrix exhibiting capillary action when a surface area of said matrix is contacted by a fluid which will not decompose said capillary matrix, a dissolvable chemical composition positioned on a surface of said matrix, housing means comprising a flexible plastic envelope containing said matrix and said chemical composition, a portion of said envelope beneath said matrix having a plurality of apertures, a second capillary matrix resting on said chemical composition and a second chemical composition resting on said second capillary matrix and beneath a portion of said housing means.
Claim 4
Dependent Claim
19 words
A chemical dispenser apparatus as recited in claim 4 wherein said capillary matrix comprises a porous polyurethane foam composition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |