1. Whether an unsigned medical equipment rental contract is valid

An unsigned rental contract for medical equipment (like ventilators, dialysis machines, ICU beds, etc.) is:

✔ Not automatically invalid

A contract does NOT necessarily require a signature to be enforceable.

What matters is:

• Offer
• Acceptance
• Consideration (rent/payment)
• Intention to create legal relations
• Conduct of parties

👉 Under Section 10 of the Indian Contract Act, 1872, a contract is valid if free consent and lawful consideration exist, not necessarily a signature.

2. When an unsigned contract becomes enforceable

Courts usually enforce an unsigned medical equipment rental contract when:

• Equipment was delivered
• Rent was paid (even partly)
• Invoices were accepted
• Equipment was used in hospital/clinic
• Emails/POs confirm agreement
• Parties acted on terms

👉 This is called “contract by conduct”

3. When an unsigned contract becomes weak / unenforceable

It may fail if:

• No proof of acceptance
• Only draft agreement exists
• No delivery or usage
• Dispute over essential terms (price, duration)
• One party denies agreement and no conduct supports it

4. Important Case Laws (India & common legal principles)

1. Caravel Shipping Services v. Premier Sea Foods (Supreme Court, 2018)

• Held: An arbitration agreement need not be signed
• Principle: Written intent + conduct is sufficient

👉 Important for rental disputes with arbitration clauses

2. Glencore International AG v. Shree Ganesh Metals (Supreme Court, 2025 analysis trend)

• Held: Unsigned agreements can still be binding if acted upon
• Conduct like supply + invoices proves consent

👉 Strong authority for commercial equipment contracts

3. Trimex International FZE v. Vedanta Aluminium (2010) 3 SCC 1

• Held: Contract concluded through emails and conduct is enforceable
• Signature not essential

👉 Very relevant to equipment rentals via purchase orders

4. K. K. Modi v. K. N. Modi (1998) 3 SCC 573

• Held: Intention and conduct determine contractual obligation
• Even informal arrangements can create binding duties

5. Brij Mohan v. Sugra Begum (1990) 4 SCC 147

• Held: Written agreement not mandatory if terms are proved otherwise

6. State of Bihar v. Karam Chand Thapar (1962 SCR Supl. 827)

• Held: Government contract without proper formal signature can still be binding if acted upon

7. United Bank of India v. Ramdas Mahadeo Prashad (2004) 1 SCC 139

• Held: Conduct and acceptance can prove contractual relationship even without formal execution

8. Bihar State Mineral Development Corp. v. Encon Builders (2003) 7 SCC 418

• Held: Execution is not always required if performance proves agreement

5. Special relevance in Medical Equipment Rental

Medical equipment rental contracts often involve:

• Emergency supply (ICU, ventilators)
• Urgent oral/telephonic orders
• Immediate delivery before paperwork
• Running hospital operations

Courts generally consider:

✔ Strong enforceability factors:

• Delivery challans signed
• Hospital usage records
• Maintenance logs
• Rental invoices accepted
• Partial payments made

❌ Weak enforceability factors:

• No proof of delivery
• Denial of acceptance
• No invoices or communication trail

6. Legal nature of such contracts

An unsigned medical rental contract is usually treated as:

(A) Implied Contract

Arises from conduct (use + payment)

(B) Quasi-contract (Section 70 ICA)

Even without formal agreement, law may impose liability for benefit received

7. Key legal principle summary

Courts repeatedly hold:

“A contract is not invalid merely because it is unsigned. What matters is acceptance and performance.”

8. Practical legal conclusion

A medical equipment rental contract unsigned is:

✔ Enforceable if:

• Equipment was supplied
• Hospital used it
• Payments or invoices exist
• Conduct shows acceptance

❌ Weak if:

• No delivery proof
• Pure draft agreement
• No conduct indicating consent