Patent US3608870A successfully refreshed from Google Patents.
US3608870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable mixture dispensing head
Assignee: Vitafoam Ltd
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Filing: 1969-03-28
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Granted: 1971-09-28
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Expires: 1989-03-28
Abstract
Abstract A dispensing head for dispensing foam mixtures, the dispensing head including a mixing chamber having an impeller mounted within the mixing chamber, first feed and return lines for simultaneously admitting premixed nonreactive components and reactive components to the mixing chamber, and second feed and return lines for simultaneously admitting a second premixed nonreactive component and the reactive component to said mixing chamber.
Inventors
- 👤 John Brian Aldridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:20
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/404; B01; B01F; B01F27/00; B01F27/80; B01F27/92; B29B7/74; B29B7/7438; B29B7/7442; B29B7/7404; B29B7/7409; B29B7/7414
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A dispensing head for dispensing any one of a plurality of formulations of foamable mixtures, said dispensing head including a mixing chamber, an impeller located in said mixing chamber, means for driving said impeller to mix components fed thereto, a first feed and return line for premixed nonreactive components operatively connected to said mixing chamber, a first feed and return line for a reactive component operatively connected to said mixing chamber, means for simultaneously connecting said first feed and return lines for said nonreactive and reactive components to said mixing chamber for completing the selected formulation; a second feed and return line for a second premixed nonreactive component and a second feed and return line for said reactive component and means for simultaneously connecting said second feed and return lines for said reactive components and said nonreactive components to said mixing chamber.
Claim 2
Dependent Claim
142 words
A dispensing head for dispensing any one of a plurality of formulations of foamable mixtures, said dispensing head including a mixing chamber, an impeller located in said mixing chamber, means for driving said impeller to mix components fed thereto, a first feed and return line for premixed nonreactive components operatively connected to said mixing chamber, a first feed and return line for a reactive component operatively connected to said mixing chamber, means for simultaneously connecting said first feed and return lines for said nonreactive and reactive components to said mixing chamber for completing the selected formulation; a second feed and return line for a second premixed nonreactive component and a second feed and return line for said reactive component and means for simultaneously connecting said second feed and return lines for said reactive components and said nonreactive components to said mixing chamber.
Claim 3
Dependent Claim
51 words
A dispensing head as claimed in claim 1 in which the feed and return lines are connected to the mixing chamber by ports and passages, including valves in said feed and return lines, and means for sequentially controlling said valves to enable feeding and returning of components to said mixing chamber.
Claim 4
Dependent Claim
33 words
A dispensing head as claimed in claim 2 in which the valves are spring loaded and are connected to a control means slidable on the head and operable by pneumatic or hydraulic means.
Claim 5
Dependent Claim
48 words
A dispensing head as claimed in claim 3 including a first control means on tHe head operatively connected to control the valves for the first feed and return lines and a second control means on the head to control the valves for the second feed and return lines.
Claim 6
Dependent Claim
17 words
A dispensing head as claimed in claim 2 in which the valves are electrically or electronically controlled.
Claim 7
Dependent Claim
64 words
A dispensing head as claimed in claim 1 in which at least one additional feed and return line for a solvent is provided on the head and is connected to the mixing chamber whereby the solvent may be fed to the mixing chamber to purge the mixing chamber prior to transfer of feed and return of components from one set of ports to another.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |