US2997412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of code drum construction
Assignee: INSTR DEV LAB Inc
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Filing: 1957-02-25
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Granted: 1961-08-22
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Betts Peter
- 👤 Joseph S Lord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:07
CPC Classifications
H; H03; H03M; H03M1/00; Y; Y10; Y10S; Y10S200/00; Y10S200/07; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF MAKING CODE DRUMS HAVING AN OUTER CONDUCTIVE SHELL PREDETERMINED AREAS OF WHICH ARE ADAPTED TO BE CUT AWAY THEREBY FORMING ISOLATED ISLANDS OF CONDUCTIVE MATERIAL, AND A DIMENSIONALLY STABLE INSULATING TUBE FOR ROTATIVELY SUPPORTING SAID SHELL, SAID METHOD COMPRISING THE STEPS OF HELICALLY SLOTTING SAID SUPPORT TUBE TO RENDER IT RADIALLY EXPANDABLE, COATING SAID TUBE WITH A HEAT HARDENABLE RESIN, TELESCOPING SAID TUBE WITHIN SAID SHELL, RADIALLY EXPANDING SAID SUPPORT TUBE OVER ITS ENTIRE LENGTH WHEREBY SAID RESIN IS SUBJECTED TO A UNIFORM PRESSURE, AND THEREAFTER CURING SAID RESIN WHEREBY ADJACENT SURFACES OF SAID SHELL AND TUBE ARE SECURELY BONDED TOGETHER OVER THEIR ENTIRE LENGTH AND WHEREBY SAID SUPPORT TUBE IS AGAIN RENDERED DIMENSIONALLY STABLE.
Claim 2
Independent Claim
118 words
A METHOD OF MAKING CODE DRUMS HAVING AN OUTER CONDUCTIVE SHELL PREDETERMINED AREAS OF WHICH ARE ADAPTED TO BE CUT AWAY THEREBY FORMING ISOLATED ISLANDS OF CONDUCTIVE MATERIAL, AND A DIMENSIONALLY STABLE INSULATING TUBE FOR ROTATIVELY SUPPORTING SAID SHELL, SAID METHOD COMPRISING THE STEPS OF HELICALLY SLOTTING SAID SUPPORT TUBE TO RENDER IT RADIALLY EXPANDABLE, COATING SAID TUBE WITH A HEAT HARDENABLE RESIN, TELESCOPING SAID TUBE WITHIN SAID SHELL, RADIALLY EXPANDING SAID SUPPORT TUBE OVER ITS ENTIRE LENGTH WHEREBY SAID RESIN IS SUBJECTED TO A UNIFORM PRESSURE, AND THEREAFTER CURING SAID RESIN WHEREBY ADJACENT SURFACES OF SAID SHELL AND TUBE ARE SECURELY BONDED TOGETHER OVER THEIR ENTIRE LENGTH AND WHEREBY SAID SUPPORT TUBE IS AGAIN RENDERED DIMENSIONALLY STABLE.
References Cited (Backward Citations)
US1728786A
Cited
US746630A
Cited
DE693093C
Cited
US2440725A
Cited
US2493153A
Cited
US2461061A
Cited
US2808450A
Cited
US2745778A
Cited
US2789934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |