Patent US2469972A successfully refreshed from Google Patents.
US2469972A
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Machine for welding thermoplastic films
Assignee: Dow Chemical Co
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Filing: 1945-02-23
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Granted: 1949-05-10
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Expires: 1965-02-23
Abstract
No abstract record available.
Inventors
- 👤 Robert D Lowry
- 👤 Church William Roland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:09
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/224; B29C65/24; B29C65/242; B29C65/30; B29C65/305; B29C66/00; B29C66/004; B29C66/0042; B29C66/01; B29C66/03; B29C66/034; B29C66/0342; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/347; B29C66/3472; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/816; B29C66/8161; B29C66/818; B29C66/8181; B29C66/83; B29C66/834; B29C66/8341; B29C66/83421; B29C66/83423; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91231; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91421; B29C66/9161; B29C66/91641; B29C66/91643; B29C66/91645; B29C66/91651; B29C66/91655; B29C66/71; B29C66/82; B29C66/822; B29C66/8223; B29K; B29K2031/00; B29K2031/04; B29K2101/00; B29K2101/12; B29L; B29L2009/00; B29L2009/003; Y; Y10; Y10T; Y10T156/00; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1741
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2248038A
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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) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |