Patent US7285996B2 successfully refreshed from Google Patents.
Patent US4129897A successfully refreshed from Google Patents.
US3487751A
Expired / Lapsed
US
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Rolling diaphragm seal means for removing and recovering diffused gas
Assignee: US Philips Corp
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Filing: 1968-05-21
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Granted: 1970-01-06
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Expires: 1988-05-21
Abstract
No abstract record available.
Inventors
- 👤 Roelf Jan Meijer
- 👤 Henricus Cornelis Jo Beukering
- 👤 Herman Fokker
- 👤 Albert August Dros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:39
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1174631A
Cited
US2635620A
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US2830859A
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US2824620A
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US2958391A
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US3193988A
Cited
US3204858A
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US3277795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |