Patent US3615973A successfully refreshed from Google Patents.
US3615973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus of producing polyurethane resin on a substrate
Assignee: ERNEST P MEEDER
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Filing: 1968-06-03
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Granted: 1971-10-26
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Expires: 1988-06-03
Abstract
Abstract A method and apparatus of producing polyurethane resin on a substrate in a continuous manner in which the flowable at least partially unreacted resin is deposited in a thin stream in a back-and-forth movement between the substrate and a pressure web operating in conjunction with a rotating heated drum to set the resin to a solid after which the set resin and substrate in the form of a flexible sheet are removed from the heated drum. The resin may be either foamed or unfoamed and the substrate may be either permanently attached to the resin or may be stripable therefrom.
Inventors
- 👤 Ernest P Meeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:40
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B32B37/00; B32B37/10; B32B37/14; B32B37/16; B32B37/20; D; D06; D06M; D06M17/00; D06M17/04; D06M17/10; D06N; D06N3/00; D06N3/0086; B29L; B29L2007/00; B32B2255/00; B32B2255/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
The method of claim 1 wherein said thin stream of polyurethane mixture has an average cross-sectional dimension of 1/8 to 3/8 inch.
Claim 2
Dependent Claim
60 words
The method of claim 1 wherein a pair of flexible sheets are directed onto said rotating drum to provide said bite between the pair of sheets and said polyurethane mixture is flowed between said sheets at said bite, the pair of sheets and the said polyurethane therebetwEen being removed from between the drum and the pressure web as a unit.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said sheet is a release sheet which is then stripped from the resulting urethane film after said removal of the sheet and polyurethane from the drum.
Claim 4
Dependent Claim
25 words
The method of claim 1 in which a pressure sensitive adhesive is applied to said web ahead of said bite for transfer to the polyurethane.
Claim 5
Dependent Claim
32 words
The method of claim 5 wherein said sheet is a release sheet which is then stripped from the resulting urethane film after said removal of the sheet and polyurethane from the drum.
Claim 6
Dependent Claim
157 words
Apparatus for producing polyurethane adhered to a substrate, comprising: a rotatable heated drum; an endless pressure web adjacent a major portion of the peripheral surface of said drum and movable therewith, the web approaching said surface at an angled bite; means for directing a flexible sheet onto said rotating drum at said bite between said drum and web; means for directing a flowable polyurethane to the bite between said sheet and pressure web from a nozzle traversing back and forth the length of said bite and thus of said drum while said drum is rotating with said moving web to apply said polyurethane to said sheet, the dwell time of said urethane on the drum and the temperature of the drum alone being sufficient to set the liquid polyurethane to a solid while the urethane is on the drum; and means for removing said sheet and applied solid polyurethane coating from between said drum and pressure web.
Claim 7
Dependent Claim
19 words
The apparatus of claim 7 wherein said nozzle has an outlet opening of about 1/8 to 3/8 inch diameter.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |