Patent US2789489A successfully refreshed from Google Patents.
US2789489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray film holding device
Assignee: US Philips Corp
•
Filing: 1953-02-24
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Granted: 1957-04-23
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Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Zwakenberg Wiechert
- 👤 Veldhuysen Gijsbertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:52
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/42; G03B1/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR622718A
Cited
US1744773A
Cited
US1944228A
Cited
US1881352A
Cited
FR36567E
Cited
US1870091A
Cited
US1980600A
Cited
US2528308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |