US2818384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulfide polymer sealant and lubricant
Assignee: Rockwell Manufacturing Co
•
Filing: 1953-06-11
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Granted: 1957-12-31
•
Expires: 1973-06-11
Abstract
No abstract record available.
Inventors
- 👤 Blyde A Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:35
CPC Classifications
C; C08; C08L; C08L81/00; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A LUBRICATING AND SEALING COMPOSTION SUITABLE FOR USE IN PLUG VALVES COMPRISING SUBSTATIALLY FROM 55 TO 75 PARTS OF A SYNTHETIC LIQUID ORGANIC POLYSULFIDE POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 4000; FROM 0 TO 5 PARTS OF A SYNTHETIC LIQUID ORGANIC POLYSULFIDE POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 1000; SAID POLYSULFIDE POLYMERS HAVING SUBSTANTIALLY THE FOLLOWING AVERAGE STRUCTURE:
Claim 2
Dependent Claim
62 words
A LUBRICATING AND SEALING COMPOSTION SUITABLE FOR USE IN PLUG VALVES COMPRISING SUBSTATIALLY FROM 55 TO 75 PARTS OF A SYNTHETIC LIQUID ORGANIC POLYSULFIDE POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 4000; FROM 0 TO 5 PARTS OF A SYNTHETIC LIQUID ORGANIC POLYSULFIDE POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 1000; SAID POLYSULFIDE POLYMERS HAVING SUBSTANTIALLY THE FOLLOWING AVERAGE STRUCTURE:
References Cited (Backward Citations)
US2467146A
Cited
US2474859A
Cited
US2484369A
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US2562144A
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US2477311A
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US2467148A
Cited
US2487260A
Cited
US2522460A
Cited
US2668757A
Cited
US2653131A
Cited
US2696469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |