Patent US3830681A successfully refreshed from Google Patents.
US3830681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package sealing in steam atmosphere
Assignee: FMC Corp
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Filing: 1972-11-08
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Granted: 1974-08-20
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Expires: 1992-11-08
Abstract
Abstract A sealing apparatus especially adapted for closing container pouches, either formed of, or coated with thermoplastic material, while the pouches are being processed in a steam atmosphere within a sterilizer or cooker. The disclosure particularly concerns the sealing head and the manner in which the cooperating elements of the sealing head coact to ensure intimate contact and coextensive bonding between the walls defining the open end of the pouch, while the pouch is in a steam atmosphere.
Inventors
- 👤 D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:52
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/70; B29C66/73; B29C66/737; B29C66/7373; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/224; B29C65/228; B29C65/24; B29C65/30; B29C65/305; B29C65/38; B29C66/001; B29C66/004; B29C66/0042; B29C66/0044; B29C66/01; B29C66/02; B29C66/024; B29C66/0242; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/349; B29C66/3494; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/812; B29C66/8122; B29C66/8126; B29C66/81261; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81421; B29C66/81422; B29C66/8145; B29C66/81457; B29C66/816; B29C66/8167; B29C66/818; B29C66/8181; B29C66/8182; B29C66/81821; B29C66/81825; B29C66/8187; B29C66/81871; B29C66/82; B29C66/822; B29C66/8221; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8324; B29C66/83241; B29C66/84; B29C66/849; B29C66/8491; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91231; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91441; B29C66/91443; B29C66/91445; B29C66/9161; B29C66/91641; B29C66/91643; B29C66/91645; B29C66/91651; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C66/91935; B65; B65B; B65B51/00; B65B51/10; B65B51/26; B65B51/30; B29C66/71; B29C66/81264; B29C66/91423; B29C66/91653; B29C66/96; B29C66/961; B29K; B29K2995/00; B29K2995/0037; B29K2995/007; B29L; B29L2031/00; B29L2031/712; B29L2031/7128
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
223 words
A sealing head comprising two confronting gripping jaws arranged to grip the plies of a thermoplastic web intermediate said jaws, one of said jaws having a convex gripping face which is resilient and capable of deforming under pressure, the other of said jaws having a substantially flat gripping face which is relatively non-resilient, means for heating said flat gripping jaw to maintain a stable temperature below the sealing temperature of the web, means for clamping said gripping jaws together against an interposed web, an impulse sealer extending across the face of said flat gripping jaw, means for periodically electrically energizing said impulse sealer to briefly heat the sealer to the sealing temperature of the web after said resilient jaw has been deformed under the gripping pressure of said jaws on the web, said heating means for said flat gripping jaw preheating the web to minimize the electrical input to said impulse sealer by reducing the temperature differential between web temperature and sealing temperature, means mounting said gripping jaws for conjoint movement toward and away from the web, and thermal insulating means interposed between each of said gripping jaws and said mounting means, means for spatially displacing the web during the sealing operation, and means for moving said gripping jaws with the displaced web to prolong the available dwell time for the sealing operation.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |