US3352212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well swab device
Assignee: Dresser Industries Inc
•
Filing: 1962-05-03
•
Granted: 1967-11-14
•
Expires: 1982-05-03
Abstract
No abstract record available.
Inventors
- 👤 Norman W Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:17
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN A SWAB SEALING DEVICE. A SUPPORT; A PLURALITY OF UPWARDLY PROJECTING RESILIENT FLANGES ATTACHED TO THE SUPPORT; THE SAID FLANGES BEING PROGRESSIVELY PROJECTED UPWARDLY AT A LESSER ANGLE TO THE AXIS OF THE SUPPORT, AND ARE PROGRESSIVELY LONGER AND LESS IN RADIAL WIDTH FROM THE TOPMOST DOWN.
Claim 2
Dependent Claim
48 words
IN A SWAB SEALING DEVICE. A SUPPORT; A PLURALITY OF UPWARDLY PROJECTING RESILIENT FLANGES ATTACHED TO THE SUPPORT; THE SAID FLANGES BEING PROGRESSIVELY PROJECTED UPWARDLY AT A LESSER ANGLE TO THE AXIS OF THE SUPPORT, AND ARE PROGRESSIVELY LONGER AND LESS IN RADIAL WIDTH FROM THE TOPMOST DOWN.
References Cited (Backward Citations)
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US214919A
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US1449674A
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US2358908A
Cited
US2719768A
Cited
US2973983A
Cited
US3062601A
Cited
US3023062A
Cited
US3031241A
Cited
US3266384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |