Patent US4814119A successfully refreshed from Google Patents.
US4814119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of hollow articles
Assignee: BASF SE
•
Filing: 1987-10-29
•
Granted: 1989-03-21
•
Expires: 2007-10-29
Abstract
Abstract The invention relates to a process for the manufacture of hollow articles, in which a photocurable resin is introduced into a mold which transmits light, the mold is irradiated until the resin has polymerized to the desired depth, the remaining resin is allowed to run out and the partially polymerized layer is then fully cured. The hollow articles may be used in particular as expendable cores in the manufacture of plastics containers by the winding process.
Inventors
- 👤 Dankmar Scholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:17
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/18; B29C35/00; B29C35/02; B29C35/08; B29C35/0888; B29C53/00; B29C53/80; B29C53/82; B29C53/821; B29C53/822; B29K; B29K2031/00; B29K2067/00; B29K2067/06; B29K2105/00; B29K2105/0002; B29L; B29L2022/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
A process for the manufacture of hollow articles which comprises: (a) introducing a photocurable resin into a mold which transmits light; (b) irradiating the mold uniformly from all sides, to form a partially polymerized layer; (c) causing the unpolymerized, liquid resin to run out of the mold; (d) fully curing the partially polymerized layer, and (e) separating the mold from the hollow article.
Claim 2
Dependent Claim
63 words
A process for the manufacture of hollow articles which comprises: (a) introducing a photocurable resin into a mold which transmits light; (b) irradiating the mold uniformly from all sides, to form a partially polymerized layer; (c) causing the unpolymerized, liquid resin to run out of the mold; (d) fully curing the partially polymerized layer, and (e) separating the mold from the hollow article.
Claim 3
Dependent Claim
38 words
The process of claim 1, further comprising surrounding the hollow article separated from the mold with plastic material to form a plastic article, wherein the hollow article separated from the mold is a core in the plastic article.
Claim 4
Dependent Claim
51 words
The process of claim 1, further comprising winding a fiber roving impregnated with a reactive resin around the hollow article separated from the mold and curing the resin to produce a second hollow article, wherein the hollow article separated from the mold becomes an internal layer in the second hollow article.
References Cited (Backward Citations)
US2524862A
Cited
US2808623A
Cited
US2786007A
Cited
US2941934A
Cited
US2963747A
Cited
US3246054A
Cited
US3317646A
Cited
US4265723A
Cited
US4425287A
Cited
US4575330A
Cited
US4575330B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |