US3996084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock core panel
Assignee: Cities Service Co
•
Filing: 1975-05-21
•
Granted: 1976-12-07
•
Expires: 1995-05-21
Abstract
Abstract A lock core panel wherein a face sheet, base sheet and core are integrally joined at each web line by fiber material prior to curing. The upper face sheet comprises layers which may be angularly oriented and selected fibers or strands removed, if desired, to provide desired porosity for noise suppression purposes.
Inventors
- 👤 Richard N. Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:07
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/56; B29C65/62; B32; B32B; B32B5/00; B32B5/02; B32B5/06; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/438; B29C66/70; B29C66/72; B29C66/721; B29C66/7214; B29C66/72141; B29C66/80; B29C66/83; B29C66/836; B32B5/12; B32B5/22; B32B5/24; B32B5/26; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/3405; B29C66/7212; B29C66/73; B29C66/737; B29C66/7379; B29C66/73793; B29L; B29L2024/00; B29L2024/003; B32B38/00; B32B2038/0052; B32B2038/008; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/10; B32B2607/00; E04C2002/3444; E04C2002/345; E04C2002/3494; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003; Y10T428/00; Y10T428/15; Y10T428/24; Y10T428/24033; Y10T428/24058; Y10T428/24124; Y10T428/24149
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
The method of making a lock core panel of layers of strands forming a face sheet, a base sheet spaced from said face sheet and impervious to sound waves, and a core sheet, said sheets being fibrous, said fibrous sheets preimpregnated with a resin, comprising the steps of alternately stitching the core sheet to the face and to the base sheet, forming the resulting composite to its resultant shape and curing to create a rigid structural panel.
Claim 2
Independent Claim
77 words
The method of making a lock core panel of layers of strands forming a face sheet, a base sheet spaced from said face sheet and impervious to sound waves, and a core sheet, said sheets being fibrous, said fibrous sheets preimpregnated with a resin, comprising the steps of alternately stitching the core sheet to the face and to the base sheet, forming the resulting composite to its resultant shape and curing to create a rigid structural panel.
Claim 3
Dependent Claim
33 words
The method of making a lock core panel as in claim 1 wherein said face sheet is formed by angularly orienting said layers of strands and fastening them together for improved strength characteristics.
Claim 4
Dependent Claim
36 words
The method of making a lock core panel as in claim 1 wherein preselected fibers are removed from the face sheet before curing to provide openings in said face sheet through which acoustic energy may pass.
Claim 5
Dependent Claim
34 words
The method of making a lock core panel as in claim 3 wherein said preselected fibers are of solvent removable rayon acetate which are removed with a solvent before curing of the face sheet.
Claim 6
Dependent Claim
35 words
The method of making a lock core panel as in claim 3 wherein said preselected fibers are of water soluble poly vinyl alcohol which are removed with water prior to curing of the face sheet.
References Cited (Backward Citations)
US1804529A
Cited
US2081765A
Cited
US3502171A
Cited
US3544417A
Cited
US3769142A
Cited
US3831710A
Cited
US3874958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |