US4023733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam dispensing apparatus
Assignee: Instapak Corp
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Filing: 1975-09-26
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Granted: 1977-05-17
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Expires: 1995-09-26
Abstract
Abstract Apparatus for making and dispensing two liquids, such as organic resins and polyisocyanates which react to form a polyurethane foam. The apparatus comprises a dispensing gun including a mixing chamber having two liquid entry ports in a non-aligned relationship with each other. One of the entry ports is positioned forward or upstream from the other. A reciprocally mounted valving rod has an extended position for closing the ports and a retracted-position for opening the ports and permitting liquid flow into the mixing chamber.
Inventors
- 👤 Charles R. Sperry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:04
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/80; B29B7/802; B29B7/803; B05; B05B; B05B15/00; B05B15/50; B05B15/55; B29B7/74; B29B7/76; B29B7/7663; B29B7/7678; B29K; B29K2105/00; B29K2105/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
In an apparatus for mixing and dispensing a plurality of liquids having a housing means, a mixing chamber in said housing means having an outlet at its forward end and a plurality of entrance ports upstream of said outlet and each entrance port for introducing fluid into said chamber, a movable valving rod for opening and closing said entrance port, means for moving said valving rod from a forward or extended-position to rear or retracted-position away from said forward end, and a reservoir adapted to hold material for cleaning said rod when in said retracted position, said rod having a reduced cross-sectional portion intermediate the ends thereof having a portion with a flat side, said flat side being positioned in said reservoir when the rod is in said retracted-position and out of the reservoir and within the mixing chamber when the rod is in the extended position, the improvement comprising: said entrance ports being positioned opposed and axially offset from each other.
Claim 2
Dependent Claim
162 words
In an apparatus for mixing and dispensing a plurality of liquids having a housing means, a mixing chamber in said housing means having an outlet at its forward end and a plurality of entrance ports upstream of said outlet and each entrance port for introducing fluid into said chamber, a movable valving rod for opening and closing said entrance port, means for moving said valving rod from a forward or extended-position to rear or retracted-position away from said forward end, and a reservoir adapted to hold material for cleaning said rod when in said retracted position, said rod having a reduced cross-sectional portion intermediate the ends thereof having a portion with a flat side, said flat side being positioned in said reservoir when the rod is in said retracted-position and out of the reservoir and within the mixing chamber when the rod is in the extended position, the improvement comprising: said entrance ports being positioned opposed and axially offset from each other.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |