US3367818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strengthening edges of foam sandwich structure
Assignee: Honeywell International Inc
•
Filing: 1966-08-01
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Granted: 1968-02-06
•
Expires: 1986-08-01
Abstract
No abstract record available.
Inventors
- 👤 Walter D Voelker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:53
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/22; B29C44/32; B29C44/321; B29C44/326; B29C63/00; B29C63/0026; B29C63/0034; B29C63/0039; B32; B32B; B32B27/00; B29L; B29L2007/00; B29L2009/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1034; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249984; Y10T428/249987
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A METHOD FOR THE CONTINUOUS PRODUCTION OF A SANDWICH STRUCTURE COMPRISING UPPER AND LOWER FACING SHEETS AND A CORE OF RIGID POLYURETHANE FOAM, THE IMPROVEMENT WHICH COMPRISES: (1) PLACING SHEET MATERIAL IN CONTACT WITH THE TWO SURFACES DEFINING THE OPPOSING LONGITUDINAL SIDE-EGES OF THE FOAM CORE AS THE SANDWICH STRUCTURE IS ADVANCED SUBSEQUENT TO THE TIME WHEN THE FOAM CORE BECOMES RIGID; (2) COMPRESSING SAID LONGITUDINAL EDGE SURFACES HAVING SAID SHEET MATERIAL IN CONTACT THEREWITH; (3) APPLYING HEAT TO SAID SHEET MATERIAL AND COMPRESSED UNDERLYING FOAM SUFFICIENT TO SOFTEN THE UNDERLYING FOAM AND FORM A DENSE PROTECTIVE SKIN THEREFROM; AND (4) COOLING SAID DENSIFIED SKIN AND SHEET MATERIAL TO RECOVER A SANDWICH STRUCTURE HAVING SAID SHEET MATERIAL BONDED TO SAID DENSIFIED SKIN.
Claim 2
Dependent Claim
123 words
IN A METHOD FOR THE CONTINUOUS PRODUCTION OF A SANDWICH STRUCTURE COMPRISING UPPER AND LOWER FACING SHEETS AND A CORE OF RIGID POLYURETHANE FOAM, THE IMPROVEMENT WHICH COMPRISES: (1) PLACING SHEET MATERIAL IN CONTACT WITH THE TWO SURFACES DEFINING THE OPPOSING LONGITUDINAL SIDE-EGES OF THE FOAM CORE AS THE SANDWICH STRUCTURE IS ADVANCED SUBSEQUENT TO THE TIME WHEN THE FOAM CORE BECOMES RIGID; (2) COMPRESSING SAID LONGITUDINAL EDGE SURFACES HAVING SAID SHEET MATERIAL IN CONTACT THEREWITH; (3) APPLYING HEAT TO SAID SHEET MATERIAL AND COMPRESSED UNDERLYING FOAM SUFFICIENT TO SOFTEN THE UNDERLYING FOAM AND FORM A DENSE PROTECTIVE SKIN THEREFROM; AND (4) COOLING SAID DENSIFIED SKIN AND SHEET MATERIAL TO RECOVER A SANDWICH STRUCTURE HAVING SAID SHEET MATERIAL BONDED TO SAID DENSIFIED SKIN.
References Cited (Backward Citations)
US2866730A
Cited
US3303076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-05 | 1971-08-07 | 1972-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-05 | 1975-08-07 | 1976-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-05 | 1979-08-07 | 1980-02-06 | $7700.00 | Window Closed / Lapsed |