US2724673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an inflatable core
Assignee: Individual
•
Filing: 1953-04-24
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Granted: 1955-11-22
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Expires: 1973-04-24
Abstract
No abstract record available.
Inventors
- 👤 Hunter Eldred Tait
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:31
CPC Classifications
B; B29; B29D; B29D22/00; B29K; B29K2021/00; B29K2105/00; B29K2105/0058; B29K2105/0064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A METHOD OF MANUFACTURING INFLATABLE CORES FOR USE IN MAKING TUBULAR OPENINGS IN CEMENTITIOUS MASSES, THE STEPS OF APPLYING A LAYER OF UNCURED RUBBER TO A MANDREL, APPLYING A CONTRACTABLE SHEATH OF STRANDS AROUND SAID LAYER WHILE IMPARTING A TWIST CHARACTERISTIC THERETO, APPLYING AN OUTER LAYER OF UNCURED RUBBER OVER SAID SHEATH AND EXERTING A TWISTING FORCE UPON SAID OUTER
Claim 2
Dependent Claim
61 words
IN A METHOD OF MANUFACTURING INFLATABLE CORES FOR USE IN MAKING TUBULAR OPENINGS IN CEMENTITIOUS MASSES, THE STEPS OF APPLYING A LAYER OF UNCURED RUBBER TO A MANDREL, APPLYING A CONTRACTABLE SHEATH OF STRANDS AROUND SAID LAYER WHILE IMPARTING A TWIST CHARACTERISTIC THERETO, APPLYING AN OUTER LAYER OF UNCURED RUBBER OVER SAID SHEATH AND EXERTING A TWISTING FORCE UPON SAID OUTER
References Cited (Backward Citations)
US1011090A
Cited
US1230867A
Cited
US1679345A
Cited
US1914455A
Cited
US1949650A
Cited
US2312587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |