Patent US4073841A successfully refreshed from Google Patents.
US4073841A
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Process for uniformly filling cavities with a foam insulating material
Assignee: Bayer AG
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Filing: 1975-10-02
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Granted: 1978-02-14
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Expires: 1995-10-02
Abstract
Abstract Cavities are filled with a foam insulating material by introducing the reaction mixture through the outlet nozzle of a mixing head which is drawn lengthwise through the cavity at a rate adapted to the rate of foaming, wherein the reactivity of the reaction mixture is accelerated during the filling procedure so that the reaction mixture is foaming up simultaneously over the length of the cavity.
Inventors
- 👤 Gerd Dultgen
- 👤 Wolfgang Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:24
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/385; B29C44/386; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
A process for filling a cavity with insulating material, comprising introducing a liquid, foamable reaction mixture into the cavity through the outlet nozzle of a mixing head while simultaneously drawing the mixing head through the cavity and accelerating the reactivity of the reaction mixture from the beginning of the filling procedure to its end by increasing the amount of catalyst to the foamable reaction mixture.
Claim 2
Dependent Claim
65 words
A process for filling a cavity with insulating material, comprising introducing a liquid, foamable reaction mixture into the cavity through the outlet nozzle of a mixing head while simultaneously drawing the mixing head through the cavity and accelerating the reactivity of the reaction mixture from the beginning of the filling procedure to its end by increasing the amount of catalyst to the foamable reaction mixture.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said cavity is formed between a conduit pipe and a jacket surrounding it.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein the cavity is inclined at an angle of between 3° and 20° during introduction of the mixture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |