Patent US3677874A successfully refreshed from Google Patents.
US3677874A
Expired / Lapsed
US
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Insulation product and method
Assignee: WR Grace and Co
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Filing: 1970-03-24
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Granted: 1972-07-18
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Expires: 1990-03-24
Abstract
Abstract AN INSULATION BOARD IS MADE BY LAMINATING TO THE SURFACE OF A BODY OF FOAMED PLASTIC RESIN, SUCH AS FOAMED POLYSTYRENE, A FILM OF HIGHER DENSITY FOAMED PLASTIC RESIN SUCH AS FOAMED POLYSTYRENE.
Inventors
- 👤 Robert W Sterrett
- 👤 Francis J Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:34
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/32; B32B7/00; B32B7/02; B32B27/00; B32B38/00; B32B38/06; E; E04; E04D; E04D3/00; E04D3/35; E04D3/351; E04D3/352; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0221; B32B2266/0228; B32B2266/0278; B32B2419/00; B32B2419/06; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24512; Y10T428/24595; Y10T428/24802
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |