US3673617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral tops and bowls for sinks and the like and methods of making the same
Assignee: ROBERT D SCHULZ JR
•
Filing: 1969-09-16
•
Granted: 1972-07-04
•
Expires: 1989-09-16
Abstract
Abstract An integral sink top and bowl structure and method of making the same are provided having an outer layer of rigid resin reinforced with fibers and an inner layer of substantially greater thickness of a foamed in situ resin fixed to said outer layer, said foamed resin having a density between about 5 to 20 lbs per cubic foot and a dense, hard skin on the exposed surfaces thereof.
Inventors
- 👤 Robert D Schulz Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:17
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/12; E03C1/18; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29L; B29L2031/00; B29L2031/769; B29L2031/7698; Y; Y10; Y10S; Y10S4/00; Y10S4/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
An integral sink top and bowl structure as claimed in claim 1 wherein the outer layer is composed of fiber glass reinforced resin from the group consisting of polyester resin and epoxy resin.
Claim 2
Dependent Claim
20 words
An integral sink top and bowl structure as claimed in claim 1 wherein the foamed in situ resin is urethane.
Claim 3
Dependent Claim
37 words
An integral sink top and bowl structure as claimed in claim 2 where in the foamed in situ resin is formed of a polyol from the group polyester and polyether, an isocyanate, a surfactant and a catalyst.
Claim 4
Dependent Claim
23 words
An integral sink top and bowl structure as claimed in claim 1 having a preformed plastic tube formed therein as an overflow drain.
Claim 5
Independent Claim
86 words
The method of forming an integral sink top and bowl comprising the steps of: a. applying a layer of rigid resin and fibers to the inner surfaces of a mold, b. closing said mold, c. foaming in said closed mold a composition capable of forming a foam of a density between about 2 and 20 lbs. per cubic foot with a high density non-porous skin and adhered to the resin, and d. setting said foam in said mold and thereafter removing the formed top and bowl.
Claim 6
Independent Claim
63 words
The method of forming an integral sink top and bowl comprising the steps of: a. forming a top and botTom shell of fiberglass and resin, b. placing said top and bottom in spaced relation to form a hollow core, c. foaming a resin within said spaced top and bottom having a density in the range of 2 to 20 lbs per cubic foot.
References Cited (Backward Citations)
FR1212667A
Cited
FR1227969A
Cited
US3120570A
Cited
US3045254A
Cited
US3255061A
Cited
US3220902A
Cited
US3231439A
Cited
US3391823A
Cited
US3433860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |