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Patent US2500720A successfully refreshed from Google Patents.
US2500720A
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Pipe connection
Assignee: Van Der Heem BV
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Filing: 1948-03-04
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Granted: 1950-03-14
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Expires: 1968-03-04
Abstract
No abstract record available.
Inventors
- 👤 Heem Jan Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:55
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/04; A; A47; A47L; A47L9/00; A47L9/24; A47L9/242; E; E04; E04D; E04D13/00; E04D13/04; E04D13/08; F16L; F16L37/00; F16L37/02; E04D2013/0846
Claims Analysis
Total Claims: 0
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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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |