US3281302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for welding thermoplastic films
Assignee: Dow Chemical Co
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Filing: 1963-09-09
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Granted: 1966-10-25
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Expires: 1983-09-09
Abstract
No abstract record available.
Inventors
- 👤 Marvin J Kreh
- 👤 Arthur D Herrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C65/00; B29C65/02; B29C65/04; B29C65/14; B29C65/1403; B29C65/1425; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/49; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81421; B29C66/81422; B29C66/81423; B29C66/83; B29C66/836; B29C66/431; B29C66/4312; B29C66/71; B29C66/737; B29C66/7377; B29C66/73775; B29C66/73776; B29K; B29K2027/00; B29K2027/06; B29K2027/08; B29K2105/00; B29K2105/0085; B29K2105/25; B29K2105/253; B29K2105/256; B29L; B29L2023/00; B29L2023/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE METHOD FOR PROVIDING A CONTINOUS LONGITUDINAL SEAM ALONG LAPPED SURFACES OF ORGANIC THERMOPLASTIC FILM COMPRISING ADVANCING SAID LAPPED SURFACES BETWEEN AND IN SLIDING CONTACT WITH (1) A GROUNDED, FIXED ELECTRODE HAVINGG A SMOOTH FILM SUPPORTING SURFACE OF GENERALLY ELONGATED CONVEX SHAPE THE CENTER OF CURVATURE OF SAID ELONGATED CONVEX SURFACE LAYING ON A LINE SUBSTANTIALLY PARALLEL WITH SAID LONGITUDINAL SEAM; AND (2) A MOVABLE ELECTRODE COOPERATIVE THEREWITH HAVING A GENERALLY ELONGATED CONCAVE SURFACE, THE RADIUS OF CURVATURE OF SAID SURFACE BEING AT LEAST ONE-SIXTEENTH INCH GREATER THAN THE RADIUS OF CURVATURE OF SAID CONVEX SURFACE; AND APPLYING TO SAID MOVABLE ELECTRODE A HIGH FREQUENCY SOURCE OF ELECTRICAL POWER OPERATING AT AN INTENSITY KNOWN TO WELD SUCH FILM.
Claim 2
Independent Claim
118 words
THE METHOD FOR PROVIDING A CONTINOUS LONGITUDINAL SEAM ALONG LAPPED SURFACES OF ORGANIC THERMOPLASTIC FILM COMPRISING ADVANCING SAID LAPPED SURFACES BETWEEN AND IN SLIDING CONTACT WITH (1) A GROUNDED, FIXED ELECTRODE HAVINGG A SMOOTH FILM SUPPORTING SURFACE OF GENERALLY ELONGATED CONVEX SHAPE THE CENTER OF CURVATURE OF SAID ELONGATED CONVEX SURFACE LAYING ON A LINE SUBSTANTIALLY PARALLEL WITH SAID LONGITUDINAL SEAM; AND (2) A MOVABLE ELECTRODE COOPERATIVE THEREWITH HAVING A GENERALLY ELONGATED CONCAVE SURFACE, THE RADIUS OF CURVATURE OF SAID SURFACE BEING AT LEAST ONE-SIXTEENTH INCH GREATER THAN THE RADIUS OF CURVATURE OF SAID CONVEX SURFACE; AND APPLYING TO SAID MOVABLE ELECTRODE A HIGH FREQUENCY SOURCE OF ELECTRICAL POWER OPERATING AT AN INTENSITY KNOWN TO WELD SUCH FILM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |