US3353219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-forming mold
Assignee: Dow Chemical Co
•
Filing: 1965-11-08
•
Granted: 1967-11-21
•
Expires: 1985-11-08
Abstract
No abstract record available.
Inventors
- 👤 Robert P Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:49
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/03; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/36; B29C51/365; Y; Y10; Y10S; Y10S425/00; Y10S425/119
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A VACUUM-FORMING, FOUR-LAYER MOLD FOR IMPARTING SHAPE TO A SHEET MATERIAL WHICH COMPRISES (1) A FLUID-IMPERVIOUS SUPPORT LAYER COVERED WITH (2) A THICK, POROUS, RIGID LAYER OF CARSE PARTICLES, (3) A THIN, FLUID-IMPERVIOUS SHEET MATERIAL COVERING SAID THICK LAYER, AND (4) A THIN, POROUS, RIGID LAYER OF FINE PARTICLES COVERING SAID FLUIDIMPERVIOUS SHEET AND BEING SHAPED SO THAT ITS FREE SURFACE FUNCTIONS AS THE MOLDING SURFACE FOR IMPARTING SHAPE TO A SHEET MATERIAL, A PASSAGEWAY FOR CONNECTING A VACUUMPRODUCING MEANS TO THE INTERFACE BETWEEN SAID THIN LAYER OF FINE PARTICLES AND SAID FLUID-IMPERVIOUS SHEET, AND A MEANS FOR CAUSING A HEAT EXCHANGE FLUID TO FLOW INTO, THROUGH, AND OUT OF SAID THICK, POROUS LAYER.
Claim 2
Dependent Claim
114 words
A VACUUM-FORMING, FOUR-LAYER MOLD FOR IMPARTING SHAPE TO A SHEET MATERIAL WHICH COMPRISES (1) A FLUID-IMPERVIOUS SUPPORT LAYER COVERED WITH (2) A THICK, POROUS, RIGID LAYER OF CARSE PARTICLES, (3) A THIN, FLUID-IMPERVIOUS SHEET MATERIAL COVERING SAID THICK LAYER, AND (4) A THIN, POROUS, RIGID LAYER OF FINE PARTICLES COVERING SAID FLUIDIMPERVIOUS SHEET AND BEING SHAPED SO THAT ITS FREE SURFACE FUNCTIONS AS THE MOLDING SURFACE FOR IMPARTING SHAPE TO A SHEET MATERIAL, A PASSAGEWAY FOR CONNECTING A VACUUMPRODUCING MEANS TO THE INTERFACE BETWEEN SAID THIN LAYER OF FINE PARTICLES AND SAID FLUID-IMPERVIOUS SHEET, AND A MEANS FOR CAUSING A HEAT EXCHANGE FLUID TO FLOW INTO, THROUGH, AND OUT OF SAID THICK, POROUS LAYER.
References Cited (Backward Citations)
US2926385A
Cited
US2907070A
Cited
US3166615A
Cited
US3078508A
Cited
US3166467A
Cited
US3262159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |